Paul and Michael Sell Magazine Subscriptions by Telephone

Multiple Choice

Paul and Michael sell magazine subscriptions by telephone.Paul is paid $1.00 for every five calls he makes,while Michael is paid $1.00 for every subscription he sells,regardless of the number of calls he makes.Paul's telephoning is reinforced on a ________ schedule,whereas Michael's is reinforced on a ________ schedule.

A) variable-ratio;fixed-ratio
B) fixed-ratio;variable-ratio
C) fixed-ratio;variable-interval
D) fixed-interval;variable-ratio