(Consider This) If the law of diminishing returns applies to study time:

A) the tenth hour of study will likely be less productive than the third.
B) this implies that longer lectures are less productive than shorter ones.
C) there is no benefit to studying a subject more than five hours in any given day.
D) people with less intelligence necessarily experience diminishing returns sooner than those with greater intelligence.

The law of diminishing returns states that as one increases the amount of input (in this case, study time), the rate of increase in output (knowledge gained) will eventually decrease. Therefore, the tenth hour of study will likely be less productive than the third hour of study. This does not necessarily imply that longer lectures are less productive than shorter ones, as other factors such as the quality of the lecture and the engagement of the student also play a role in productivity. There is also no set limit on the amount of time one can study a subject per day, as this will vary based on individual factors such as the complexity of the subject and the individual's ability to focus. Lastly, while intelligence may play a role in one's ability to learn and retain information, it does not necessarily dictate the point at which diminishing returns occur.