The best example of efficiency is:
O
A. getting a B on a homework assignment that you spent two hours
on the night before.
O
B. getting a C on a homework assignment that you spent 30 minutes
on the night before, and also finishing two other assignments.
O
C. getting an A on a homework assignment that you spent three
hours on the night before.
O
D. getting an A on a homework assignment that you spent one hour
on the night before.