(Consider This) In order to apply the concept of diminishing returns to study time:

A) the amount of study time available must be held constant.
B) study time must be considered a long-run production process.
C) all inputs to the learning process must be allowed to vary.
D) all inputs to the learning process except for study time must be assumed to be fixed.

Diminishing Returns

A principle stating that if one factor of production is increased while other factors are held constant, the incremental output gained will eventually decrease.

Study Time

The amount of time allocated towards learning or academic activities outside formal teaching sessions.

Learning Process

A complex activity involving the acquisition of knowledge, skills, behaviors, or values, often through study, experience, or teaching.