With no explanation, chose the best option from "A" or "B". Carlos is a field worker in Central America and has a very dull machete when his friend offers him a sharpener. Carlos wants to sharpen his machete.

A: Carlos spends the entire night sharpening the machete to a razor-fine edge and wears out the sharpener.
B: Carlos uses the sharpener to put a fairly sharp edge on the machete, then gives it back.
B.