Which of these circuit schematics has a dc voltage source?

circuit C

Explanation:

A DC voltage source supplies current in single direction. It is represented by alternate small and big straight lines.

An Ac voltage source supplies alternating current i.e. the current changes direction.

In the given circuit diagrams, only circuit C has a DC voltage source.

what was the answer?

answer; how far out of place which the object finished relative to the starting location;