Question

a sign in front of a store says
o smoking.\ what kind of factor is this sign?
external pressure
internal pressure
media influence
peer pressure

Explanation:

The "No Smoking" sign is an external factor (from the store's environment) influencing behavior, not internal (self - driven), media - related (not media - based influence), or peer - related (no peers involved here). So it's external pressure.

Answer:

A. external pressure