Mike helped Jack with his assignment because he felt like doing so.

Who is "he" in this prior sentence?
Mike
Verizon Fios provides hundreds of channels to millions of viewers, because they want them to have a plethora of options to choose from.

Who is "they" in this prior sentence?
Verizon Fios
The police tried to blockade the bridge to prevent the criminals from escaping because they needed to pass this route to gain freedom.

Who is "they" in this prior sentence?
the criminals