1. Selling more than 15 million copies, Douglas Adams's contributions included not only the famous Hitchhiker's Guide to the Galaxy, but also comedy and radio drama.

1. Douglas Adams's contributions included not only the famous Hitchhiker's Guide to the Galaxy, but also comedy and radio drama.
   
   
2. Douglas Adams contributed not only the famous Hitchhiker's Guide to the Galaxy, but also comedy and radio drama.
   
   
3. the famous Hitchhiker's Guide to the Galaxy was only one of Douglas Adams's contributions, which also included comedy and radio drama.
   
   
4. the famous Hitchhiker's Guide to the Galaxy also included comedy and radio and was not Douglas Adams's only contribution.
   
   
5. the famous Hitchhiker's Guide to the Galaxy not only was one of Douglas Adams's contributions, but also comedy and radio drama.
   

Selling more than 15 million copies, Douglas Adams's contributions included not only the famous Hitchhiker's Guide to the Galaxy, but also comedy and radio drama.                                   

Grammar issue presented: modifiers

Selling more than fifteen million copies is a modifier. It must be placed as close as possible to what it describes.

The modifier is misplaced because it should be modifying the famous Hitchhiker's Guide to the Galaxy NOT Douglas Adams's contributions.

(Common sense tells us that the book Hitchhiker's Guide to the Galaxy is what sold 15 million copies, NOT Adams's contributions.)

Selling more than fifteen million copies, Douglas Adams's contributions included not only

the famous Hitchhiker's Guide to the Galaxy, but also comedy and radio drama.

A. Douglas Adams's contributions included not only the famous Hitchhiker's Guide to the Galaxy, but also comedy and radio drama.
Modifies: Douglas Adams's contributions
Correct: NO

B. Douglas Adams contributed not only the famous Hitchhiker's Guide to the Galaxy, but also comedy and radio drama.
Modifies: Douglas Adams' s
Correct: NO

C. the famous Hitchhiker's Guide to the Galaxy was only one of Douglas Adams' contributions, which also included comedy and radio drama.
Modifies: the famous Hitchhiker's Guide to the Galaxy
Correct: YES
Additional errors? NO

D. the famous Hitchhiker's Guide to the Galaxy also included comedy and radio and was not Douglas Adams's only contribution.
Modifies: the famous Hitchhiker's Guide to the Galaxy
Correct: YES
Additional errors?
Changes in meaning: Galaxy also included comedy and radio
The book did not include comedy and radio.
only contribution: Adams had more than one contribution. 

E. the famous Hitchhiker's Guide to the Galaxy not only was one of Douglas Adams's contributions, but also comedy and radio drama.
Modifies: the famous Hitchhiker's Guide to the Galaxy
Correct: YES
Additional errors? Improper comparison:
not only was one of Douglas Adams' contributions, but also comedy and radio drama. 

(C) is the only choice that resolves the misplaced modifier without creating additional problems.

Q.1 Hard

Q.2 Hard