Detailed Instructions: In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Problem:Fact1: Blood pH may become unbalanced if the rate of breathing is too fast or too slow., Fact2: For instance, the normal pH of human blood is maintained at 7.4., Question: What may become unbalanced if the rate of breathing is too fast or too slow? (A) normal eating (B) normal human blood (C) cigarettes (D) normal skin (E) Veins and arteries. (F) Chemical energy (G) kinetic energy (H) normal studying
Solution:
B