Answer:
A
Step-by-step explanation:
The main purpose is to descirbe the components of the Earth as well as its different layers. A is the only answer choices that summarizes each of these without any contradictions. I have some additional tips:
1. Only read the first two or three words of each answer choice to determine if the passage is providing examples, supporting a view, giving reasons, or describing something.
2. After you did that, choose the best 2 answers that are relevant to the topic of the passage (A and B, in this case).
3. Look at the topic sentence (Sentences 1 and 2) to find out which main idea describes it, as well as the passage, the best.
Hope this helps you find the answer as well as future answers! Good luck on this assignment!