Problem: How does the sentence end?

I don't think that nails work better than screws because the 
OPTIONS:
- nails can lock in to each other.
- screws can lock in to each other.
Answer: screws can lock in to each other.
sentence: The musician wanted to set up his drums in the rooms but the  OPTIONS:
- rooms were too large.
- drums were too large.
complete: drums were too large.
Skirt made of wool is more suitable for winter than one made of cotton as the 
OPTIONS:
- wool is thick.
- cotton is thick.
wool is thick.
Input: Continue writing.

Jeffrey was hired to help grow Randy's garden during the summer months because 
OPTIONS:
- Jeffrey was a homeowner.
- Randy was a homeowner.

Continued: Randy was a homeowner.
Story needs to be completed:
Laura has recently bought a diamond and asks for Jessica's opinion whether the diamond is real, because 
OPTIONS:
- Laura doesn't know.
- Jessica doesn't know.

My choice:
Laura doesn't know.
Problem: How does the sentence end?

John had to remove the computer virus from the program because the 
OPTIONS:
- computer virus was assisting it.
- program was assisting it.
Answer:
program was assisting it.