We can cite it as a situation in which Mark proved to be resilient at the very beginning of the narrative, when he enters a new world and is enslaved by the residents of that region. Instead of giving up his luck and regretting his condition, he uses this difficult time of slavery, to learn the language spoken by the local residents, so at least he would understand what his "masters" spoke, which could leave slavery more bearable. In addition, Mark uses his free time to plan an escape and he even manages to escape, but returns to warn the townspeople that she will be attacked.
Another moment when he shows that he is resilient is when he is being chased by an army, inside a forest in a world that he does not know very well. Even in a disadvantaged situation, he manages to turn things around, fight for his survival and manage to escape, always with great determination and confidence.
The changes in memory and personality occur in people with Alzheimer's disease is that they lose the ability to do common things that require basic mental processing. They could have great memory loss and personality or behavoir change.
Mount Everest is not a person, so whom and who cannot be used.
The phrase that the blank spot is in needs a transition word to flow correctly. 'that' does not flow, as it would make this phrase grammatically incorrect.
The answer is B. which.
