Answer:
Option B. 120
Step-by-step explanation:
The freshman class has students = 160
Total number of novels = 10
As, each freshman must write 3 reports , means selecting 3 novels out of 10 novels.
Here, order of choosing novels is not important.
So, we will apply rule of combinatorics here.
Selecting 3 novels out of 10 novels , is different combinations of novels that a freshman student can choose to write reports on is given by

= 
= 
= 
= 
= 
= 120
Option B 120 different combinations of novels can a freshman student choose to write reports.