sure the answer is A. hope this helped u.
Karen is late – she must have missed her train. (no other explanation is possible)
He starts with his own account of the climb. However, he only does it with a few sentences, and then, as soon as he mentions the breathing problems, he proceeds with explaining how Hillary's account was not completely accurate. At the very beginning, the reader gets to understand that this text's purpose is not to describe the climb, but to supplement (or correct) another person's account.
There would be 11 bananas. You would add six and five together.