Teacher: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").
Teacher: Now, understand the problem? Solve this instance: Fact1: Blood pH may become unbalanced if the rate of breathing is too fast or too slow., Fact2: For example, blood pH is critical for regulating the binding and release of oxygen from hemoglobin., Question: Something critical for regulating oxygen from hemoglobin may become unbalanced if breathing is what? (A) major threat to health (B) colder and wetter (C) too fast or too slow (D) too hot and heavy (E) a lot of human deaths (F) too loud and soft (G) deadly and devastating (H) too warm and cold
Student:
C