Answer: B) because soot will no longer get in it.
Step-by-step explanation: In the given passage we can see the description of how little Tom's head was shaved, he didn't like it at all ("who cried when his head That curl’d like a lambs back, was shav’d"), but the speaker explains that it is necessary to shave his head, because if they don't, soot would continue to spoil his hair, so the correct answer is option B: Tom's hair is better off shaved because soot will no longer get in it.