C) because “clip-clip” is a sound
I am not completely sure but I think the answer is mine or miner. If you think about it you have to mine in order to get the ore out.
Hope this helps!!!
ANSWER
The correct answer is c
EXPLANATION
She asked what I was doing when I knocked at the door.
Well, because William Shakespeare lived more than 400 years ago, and many records from then are lost or were nonexistent in the first place, we don't know every single detail about his life.
I hope this helps and have a great day!! :)