QUES:
Who is they in the following sentence?

Amazon's Kindle Fire may surpass Apple's IPad because they offer a very competitive low price.

ANS:
Amazon

QUES:
Who is they in the following sentence?

The lumberjacks cut the trees so they could be sold.

ANS:
the trees

QUES:
Who is they in the following sentence?

People raise dogs because they are afraid of thieves.

ANS:
People