Hmm, I would probably go with B. While both I think are correct, B makes a little more sense.
Explanation:
the main idea is the key concept. the details help the main idea with who, what , where, when mayor or small. sorry that's all I can think of
Differential weathering happens when softer rocks weathers away and leaves harder, more resistant rock
behind
Answer:
Because he was the longest friend he had ever had and he felt an obligation to protect him
