I think he may be right. But I have not read the whole thing, so I may be wrong.
Sentence one is the topic sentence because it tells you what the paragraph is about.
Answer:
Most mountains formed from Earth's tectonic plates smashing together. Below the ground, Earth's crust is made up of multiple tectonic plates.
Explanation:
When two tectonic plates come together, their edges can crumple thus, creating the Moutian.
Answer: A. Show her brother that she can beat him.
Explanation: I got it right on the instruction/practice.
