Omar and Patrice Sell Magazine Subscriptions by Telephone

Omar and Patrice sell magazine subscriptions by telephone.Omar is paid $1.00 for every 5 calls he makes,while Patrice is paid $1.00 for every subscription she sells.Omar is paid on a ________ schedule,whereas Patrice is paid on a ________ schedule.

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