Teacher: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").
Teacher: Now, understand the problem? Solve this instance: During a prolonged shortage of water, a tree's ability to add extra tissue and grow thick rings is slowed and the tree produces (A) wider growth rings (B) thinner growth rings (C) more leafy growths (D) annual scar tissue
Student:
B