hi I need help I will mark brainlest 1. Which is the BEST example of a community responding to an external factor? A. Plants and animals thrive on the forest floor after the fall of a white pine causes an opening in the canopy. B. Many species of raptors fly alongside each other during the autumn migration to warmer climates. C. Elephants use their tusks to dig the salt needed in their diets from the wall of a cave. D. Adult musk oxen in a herd surround their young to protect them from wolves. i know it looks long but its only one question with multiple choice