The answer is D, i believe
What is your question what do you not get?
The answer to this question is option A. All you needed to do was to arrange it in a manner that explains the event that took place first
Hello!
Let's go through the given choices to find which word is a synonym for knocking.
A. Rapping means to strike something, specifically hard, loudly, to attract attention.
B. Ticking means to make sharp, short movements like a clock does.
C. Thundering means to make a loud, deep noise.
D. Popping means to make an explosive sound.
Therefore, the answer is A, rapping because knocking is striking a surface to get attention, which is similar to rapping.
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