Question:
Several energy companies are under investigation by Congress since they need to find out if the money was mishandled.

Who is they referring to in this sentence?
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Answer:
Congress

Question:
The lion bit the gazelle because it had horns.

Who is it referring to in this sentence?
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Answer:
the gazelle

Question:
Bethesda launched a new title, Skyrim, to raving reviews by gamers because they produced an excellent story to immense the player.

Who is they referring to in this sentence?
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Answer:
Bethesda

Question:
Steve scratched Johnny so he became angry.

Who is he referring to in this sentence?
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Answer:
Johnny