Lucy gave a tutorial on how to install IOS 5 to Cindy since she is familiar with software upgrades.

Who is "she" in this prior sentence?
Lucy
Stephen Colbert is funnier than John Stewart since his show has less viewers.

Who is "his" in this prior sentence?
John Stewart
AOL finally had their CEO step down to respect the wishes of the stakeholders because they needed to listen to their investors.

Who is "they" in this prior sentence?
AOL