In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").

Hardness of minerals may be measured in certain ways, such as what? (A) heating the minerals to high temperatures (B) applying pressure using a sharp, tough object in order to leave marks (C) hitting the minerals with a tougher stone (D) taking bits of metal and comparing the texture to the minerals
B