Keep the base of your on the mouse pad or desk? A. thumb
B. palm
C. wrist
D. arm

palm

Explanation:

The best way to hold a computer mouse is to not rest your wrist or forearm on the desk. By lifting your wrist off the desk you will use your whole arm to move the mouse, which will reduce the risk of you straining the nerve in your wrist and developing carpal tunnel.

to be honest, I'm not completely sure. Don't use my answer as the first resort

I used a website but I can't add it :'(

two people have to answer or you have to wait a few days