You are given a science question (hard-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: Sooj learned that whales use vocalization to navigate and to communicate with other whales. Some scientists think that noise pollution in whale habitats may harm whale populations. What would be the most likely effect of noise pollution on whales?
(A) alteration of whale genetic material (B) reversed flow of energy through whale habitats (C) reduced populations of food organisms in whale habitats (D) separation of whale family groups

Answer: D

Question: Which pair of organisms benefits each other the most?
(A) birds building a nest in a bush (B) worms eating the roots of a plant (C) squirrels burying seeds from a tree (D) deer scraping their antlers on a tree

Answer: C

Question: Which characteristic property indicates that igneous rock cools slowly?
(A) mineral composition (B) hardness (C) density (D) crystal size

Answer:
D