9. The Crab Nebula is a supernova remnant in the Taurus constellation, which had been observed originally by John Bevis in 1731; the remnant itself was recorded in 1054, though the supernova occurred over 6,000 years earlier.

A. which had been observed originally by John Bevis in 1731; the remnant itself was recorded in 1054
B. which was observed originally by John Bevis in 1731; the remnant itself had been recorded in 1054
C. which was observed originally by John Bevis in 1731; the remnant itself was recorded in 1054
D. which had been observed originally by John Bevis in 1731; the remnant itself had been recorded in 1054
E. which had been observed originally by John Bevis in 1731 but the remnant itself was recorded in 1054

The Crab Nebula is a supernova remnant in the Taurus constellation, which had been observed originally by John Bevis in 1731; the remnant itself was recorded in 1054, though the supernova occurred over 6,000 years earlier.

Grammar issue presented: verb tense/time sequences: had been observed uses past perfect, which is generally used to describe events further into the past than others. In this case, the observation of the nebula in 1731 is the most recent event, so should NOT be in the past perfect.

1. which had been observed originally by John Bevis in 1731; the remnant itself was recorded in 1054
   Proper time sequence? NO
   First event: past
   Second event: past
   Third event: past perfect
   
   
2. which was observed originally by John Bevis in 1731; the remnant itself had been recorded in 1054
   Proper time sequence? NO
   First event: past
   Second Event: past perfect
   Third event: past
   
   
3. which was observed originally by John Bevis in 1731; the remnant itself was recorded in 1054
   Proper time sequence? YES
   First event: past
   Second event: past
   Third event: past
   
   
4. which had been observed originally by John Bevis in 1731; the remnant itself had been recorded in 1054
   Proper time sequence? NO
   First event: past
   Second event: past perfect
   Third event: past perfect
   
   
5. which was observed originally by John Bevis in 1731 but the remnant itself was recorded in 1054
   Proper time sequence? YES
   First event: past
   Second event: past
   Third event: past
   Additional errors? Run-on sentence

(C) uses an acceptable verb tense structure to properly describe a sequence of events, without creating additional errors.

Q.8 Hard

Q.10 Hard