Loco pilot must have ________ sets of spectacles in his personal store. A. Two B. One C. Three D. None of these

The correct answer is: A. Two.

A loco pilot must have two sets of spectacles in his personal store. One set should be for near vision and the other set should be for far vision. This is because a loco pilot needs to be able to see clearly both near and far in order to operate the train safely.

Option B is incorrect because a loco pilot only needs two sets of spectacles, not one. Option C is incorrect because a loco pilot does not need three sets of spectacles. Option D is incorrect because a loco pilot must have two sets of spectacles, not none.