A. To call men intelligent who are not strikingly so must be to use the concept with undue imprecision
Feedback The Writer clearly states in the last part of his statement, that he should or should not be inclined to call him intelligent. The only option, which reflects that intention, is the first option and thus is the answer.
Option B is wrong because we cannot generalise all empirical concepts to be vague on basis of this and it is irrelevant also. Option C and D are also vague.