Answer:
D
Step-by-step explanation:
C is one of those unconscious jokes. It is not incorrect if you mean Mt. Everest us near by you and it is climbing higher. I don't think you mean that.
The correct answer is could Mt Everest be climbed by him? This means could he still do it? That's D.
Unfortunately A is also correct. It means in past years, could he have climbed Mt. Everest?
There is no single answer. It depends on what you mean.
Four
C the best answer. It's a pretty complex verb but it means is that you did not give the opportunity. It was not offered to you is what I think is the actual answer is.