Bill triumphed over John in the boxing ring because he fought smarter.

Who is "he" in this prior sentence?
Bill
Dance Instructor Kate offers advice to Shelly because she is eager to soak up as much experience as possible.

Who is "she" in this prior sentence?
Shelly
Apple customer support is constantly voted better than Microsoft support, because they do not really offer a competitive support plan.

Who is "they" in this prior sentence?
Microsoft support