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 outside an individual's body or personal - peer circle. It is not internal pressure (which comes from within oneself), not media influence (as it's not through mass - media channels), and not peer pressure (from friends or peers). It's an external pressure to comply with the no - smoking rule.

Answer:

A. external pressure