Crank Arms are defined as:

• A. The pedals
• B. The frame tubes that connect to the bottom bracket
• C. The components that connect to the handlebars
• D. Arms or levers to which the pedals are attached and hold the front chain ring

Answer: (D)

Crank arms are the levers you push with your feet that attach to the pedals on one end and carry the front chainring on the other, rotating around the bottom bracket spindle. They convert your leg power into rotational motion that drives the chain and wheels. The pedals connect to the ends of these arms, and the front chainring is mounted to the crank arms, making this the correct description. The pedals themselves are separate, the frame tubes around the bottom bracket aren’t the crank arms, and the components that connect to the handlebars are part of the steering assembly, not the crank set.