Answer:
A. A classmate also doing research on 9/11
Step-by-step explanation:
A classmate won't know much about 9/11 since the classmate didn't get the 911 experience over 21 years ago. Someone who was saved or a fireman in NYC on 911 knows the 911 experience very well.
In addition, a classmate won't know much about 911 as a historian would.