In each set below, select the letter of the sentence in which all of the apostrophes are used correctly. In which sentence are apostrophes used correctly?

A) This must be Ichiros' van, but whose riding the motorcycle?
B) This must be Ichiro's van, but whose riding the motorcycle?
C) This must be Ichiro's van, but who's riding the motorcycle?

Ichiro's

Refers to something associated with Ichiro Suzuki, a retired Japanese professional baseball outfielder who played in Major League Baseball (MLB) and Nippon Professional Baseball (NPB).

Motorcycle

A two-wheeled vehicle powered by an engine, known for its speed, maneuverability, and the sense of freedom it provides to riders.

Riding

The act of being carried or transported on the back of an animal, especially horses, or on vehicles like bicycles and motorcycles.