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").
Q: Fact1: sand dunes are formed by the wind transporting and depositing sand, Fact2: Vegetation stabilizes the sand, preventing the wind from forming dunes., Question: What will prevent the formation of sand dunes? (A) focusing a lens (B) forces (C) energy barrier (D) flooding (E) erosion (F) less water (G) Solar energy (H) vegetation
A:
H