The fact that many students make the mistake of assuming that the question requires a comparison between lrc and mrc, may be interpreted as evidence that the question is defective. But it is also possible that the real problem is the way in which many students are addressing the questions. There is actually nothing in the question to suggest that the lrc.mrc comparison is intended.
Students often make the same error with questions along through lines of *increasing flap angle in straight and level flight will?* many student pick answers such as *increase in lift* or *the aircraft will climb*. But these options ignore the clue *in straight and level flight*.
Although the lrc question has probably been deleted from the cqb by now, I believe that it should be retained in commercial question banks in order to illustrate the danger of misinterpreting questions.