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: burning fossil fuels increases the carbon in the atmosphere, Fact2: Natural gas is the cleanest of the fossil fuels., Question: Burning which of these increases carbon in the atmosphere? (A) wind energy (B) natural gas (C) green manures (D) Greenhouse gases (E) solar energy (F) Conifers (G) engines (H) oxygen
Student:
B