Question:
The Backstreet Boys were much more popular than N-Sync since they had the better music.

Who is they referring to in this sentence?
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Answer:
The Backstreet Boys


Question:
The peace emissaries arrived to negotiate a peace treaty for the warring population, since they wish to assist in ending the war.

Who is they referring to in this sentence?
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Answer:
The peace emissaries


Question:
Chelsea hate Manchester United because they are too cocky.

Who is they referring to in this sentence?
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Answer:
Manchester United


Question:
The sheep chased the pig because it was fat.

Who is it referring to in this sentence?
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Answer:

the pig