Question

What change should be made in sentence 20?
A. ADD A COMMA AFTER ALTHOUGH
B. DELETE THE COMMA AFTER DIFFERENT
C. CHANGE TASK TO TASK'S
D. CHANGE WAS SURPRISINGLY TO WERE SURPRISINGLY.

Answer 1

The correct answer is D because there are multiple tasks

Answer 2

The answer is D.

Although the animals were different, the daily tasks of each zookeeper were
surprisingly similar. 

Reasoning for this would be if it already said: .... the animals were different, than you would want to change the was into were too.