Final answer:
A V8 engine has only one crankshaft, which converts the pistons' motion into rotary motion to turn the vehicle's wheels.
Step-by-step explanation:
The question pertains to the number of crankshafts in a V8 engine. In a typical internal combustion engine, regardless of the number of cylinders, there is only one crankshaft. The crankshaft is a crucial component that converts the up-and-down motion of the pistons into a rotary motion that eventually turns the vehicle's wheels. So, the answer to the question is D. 1 crankshaft in a V8 engine.