Question

shudder of cold horror through his whole being. why had the general smiled? why had he turned back? rainsford did not want to believe what his reason told him was true, but the truth was as evident as the sun that had by now pushed through the morning mists. the general was playing with him! the general was saving him for another days sport! the cossack was the cat; he was the mouse. then it was that rainsford knew the full meaning of terror. \i will not lose my nerve. i will not.\ what causes rainsford to fully understand what it means to be afraid? he knows that general zaroff could have caught him if he had wanted to. he figures out that if he manages to escape the island, general zaroff will send ivan after him. he discovers that general zaroff plans to train him to be a hunter. he realizes that it will be night soon and he cannot bear another night of being hunted.

Explanation:

The text indicates that Rainsford realizes General Zaroff is playing with him, that the general could have caught him if he wanted to, which makes Rainsford understand the full - meaning of terror. The other options are not supported by the given text.

Answer:

He knows that General Zaroff could have caught him if he had wanted to.