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").

[EX Q]: Fact1: Biodiversity increases the productivity and stability of ecosystems., Fact2: Ecotourism, on the other hand, can help to conserve biodiversity., Question: What increases the stability of ecosystems? (A) overpopulation (B) water consumption (C) loose soil (D) Quality of life (E) agriculture (F) deforestation (G) ecotourism (H) trees
[EX A]: G

[EX Q]: Fact1: extreme heat and pressure change rock into metamorphic rock, Fact2: Slate is a metamorphic rock., Question: What rock is formed by extreme heat and pressure (A) erosion (B) crust (C) calcite (D) Slate (E) dead (F) forces (G) fibrous (H) complex
[EX A]: D

[EX Q]: Fact1: the Earth being tilted on its rotating axis causes seasons, Fact2: Weather changes from season to season., Question: What causes weather changes on Earth?  (A) the sun's energy (B) The tilt in its rotating axis. (C) high temperature (D) Weather in space (E) Vertical movement (F) Greenhouse gases (G) Spinning backwards (H) wind and erosion
[EX A]:
B