You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.
--------
Question: Lichens are symbiotic organisms made of green algae and fungi. What do the green algae supply to the fungi in this symbiotic relationship?
(A) carbon dioxide (B) food (C) protection (D) water

Answer: B

Question: Bridge inspectors have determined that a bridge is unsafe. Which of the following is the BEST design process the company should use to correct the problem?
(A) identify the problem-repair the bridge-plan for the repair (B) plan for the repair-repair the bridge-identify the problem (C) plan for the repair-identify the problem-repair the bridge (D) identify the problem-plan for the repair-repair the bridge

Answer: D

Question: When sugar is heated on a hot plate, it turns into a liquid. When the liquid sugar is cooled, a hard-crystalline substance is formed. This model best demonstrates the formation of
(A) molten rocks. (B) igneous rocks. (C) sedimentary rocks. (D) metamorphic rocks.

Answer:
B