Which of the Following Arguments Commits the Fallacy of Equivocation

Which of the following arguments commits the fallacy of equivocation?

A) Jim has been playing poker for hours, and he's been dealt bad cards nine times in a row. The chances of being dealt bad cards ten times in a row are almost zero. Therefore, Jim will probably be dealt good cards next time.
B) If one building has more stories than another building, then the first building is taller. The Empire State Building has 102 stories. The library has thousands of stories. Therefore, the library is taller than the Empire State Building.
C) If there is a vast government conspiracy to control the population by spraying chemicals from airplanes, then the government won't admit that they are spraying chemicals from airplanes. The government won't admit that they are spraying chemicals from airplanes. Therefore, there is a vast government conspiracy to control the population by spraying chemicals from airplanes.
D) Vaccines used to contain mercury. It's unnatural to put mercury in your body. Therefore, it used to be wrong to give vaccines to children.