A nail tip should cover the nail plate from what to what?

This is correct because a nail tip should cover the entire surface or widest area of the nail plate, from one sidewall to the other. Option A is incorrect because the nail tip should not cover the cuticle area. Option C is incorrect because the nail tip should cover the entire nail plate, not just the area from cuticle to sidewall. Option D is incorrect because the nail tip should not extend all the way to the free edge, it should only cover the widest area of the nail plate.