You Check Your Cell Phone Repeatedly for a Message from Someone

Multiple Choice

You check your cell phone repeatedly for a message from someone you're interested in dating. It's impossible to know in advance how many times you need to check before the message arrives (assuming it even does!) , therefore your checking behavior is maintained according to a __________.

A) variable-ratio reinforcement schedule
B) fixed-ratio reinforcement schedule
C) variable-interval reinforcement schedule
D) fixed-interval reinforcement schedule