Question

in which case is work being done? lifting weights counting in your head sitting on a bench listening to music

Explanation:

To determine when work is done, we use the physics definition: work is done when a force causes displacement. Lifting weights involves applying a force (to overcome gravity) and moving the weights (displacement). Counting in your head, sitting on a bench (no displacement from the bench - force but no displacement), and listening to music (no force causing displacement) do not meet the work criteria.

Answer:

A. lifting weights