3. The Armet helm, developed in the 15^th century, was the first of its era to not only completely enclose the wearer's head, but also being small and light enough to move with the wearer.

1. but also being small and light enough to move with the wearer.
2. but also being able to move with the wearer because it was small and light enough.
3. but also be small and light enough to move with the wearer.
4. and it also was small and light enough to move with the wearer
5. and in addition, be small and light enough to move with the wearer.

 
The Armet helm, developed in the 15^th century, was the first of its era to not only completely enclose the wearer's head, but also being small and light enough to move with the wearer.


Grammar issue presented: parallelism

-          The sentence contains the not only…but also conjunction which is a case for parallelism.

-          All elements following the conjunction must use proper parallel construction.

This sentence contains faulty parallelism because completely enclose does not match being small and light in grammatical format.

 

A.     but also being small and light enough to move with the wearer.
Parallel? NO - to not only enclose / but also being

B.    but also being able to move with the wearer because it was small and light enough.
Parallel? NO - to not only enclose / but also being

C.    but also be small and light enough to move with the wearer.
Parallel? YES - to not only enclose / but also be (both infinitives)

D.    and it also was small and light enough to move with the wearer
Parallel? NO - conjunction is corrupted: not only / it also  

E.     and in addition, be small and light enough to move with the wearer.
Parallel? NO - conjunction is corrupted: not only / and in addition

(C) is the only choice that contains proper parallel construction

Q.2 Medium

Q.4 Medium