You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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").

Fact1: a plant requires sunlight to grow, Fact2: Plants to avoid are fast-growing vines that can take over an area in no time., Question: What requires sunlight in order to take over an area? (A) spores (B) fish (C) plants (D) humans (E) pods (F) Oak (G) opossums (H) coral
Solution: C
Why? This is a good example. Based on the facts plants require sunlight in order to take over an area.

New input: Fact1: Energy enters ecosystems in the form of sunlight or chemical compounds., Fact2: An ecosystem includes the organisms and their habitat., Question: what does energy enter in the form of sunlight or chemical compounds? (A) Generating heat (B) volume (C) colors of the spectrum (D) organisms and their habitat (E) density (F) Transfers energy (G) gravity (H) it helps plants in growing
Solution:
D