Question: Customer Support fields the questions of their customers so they could receive immediate assistance.
Based on this sentence, who is they?

Answer: their customers


Question: The dog hunted the fox because it was hungry.
Based on this sentence, who is it?

Answer: The dog


Question: Jimbo eats more than Bobbert because he is not on a diet.
Based on this sentence, who is he?

Answer: Jimbo


Question: The NSA sent their agents in the field to retrieve intelligence because they need people in the field to do the field work.
Based on this sentence, who is they?

Answer:
The NSA