Verified answer

D. protest in which people refuse to buy goods

The best answer is D, a protest in which people refusing to buy goods.

Now let's break it apart to see why that's the best answer.

Option A, "a popular method". A popular method of what? You don't know enough about this answer to even know if it's right or not.

Option B, "buying British goods". The sentence says people REFUSED to buy British goods. Therefore, a boycott can't be people buying British goods.

Option C, "people refusing". You have the same problem as in Option A. You don't know *what* people are refusing to do, and therefore you don't know enough about the answer to know if it's right or not.

Option D, "protest in which people refuse to buy goods". Look at the answer, then back at the sentence. Is a boycott a form of protest? Yes - the sentence begins, "A popular method of protest was the boycott." Check. Do people refuse to buy goods in such a protest? Yes - the second half of the sentence reads, "...in which people refused to buy British goods." Therefore, you know this is the correct, and best, answer.

d