According to the Cost-Benefit Principle,you Should Switch to Another Task

According to the cost-benefit principle,you should switch to another task or job when:

A) the benefit from performing the new task is less than the benefit from continuing to perform the original task.
B) the benefit from performing the new task just exceeds the opportunity cost of performing that new task.
C) your productivity at the first task has diminished to the point at which the benefit from continuing with that task is zero.
D) the opportunity cost of performing the original task is less than the benefit of performing the original task.