I haven't read this, so I'm going to help you figure this out for yourself. Concluding the fact that you most likely have read this, I'm going to ask you the following. On a piece of paper, or even on here, list the characteristics you think Algernon has. Once you've done that, read them. Read your options again. You should find your answer. If not, post the listed characteristics on here and I'll see if I can help you better understand.
Not sure but should be B im not sure tho 100%
Answer: So, your main idea or thesis here that you are talking about in this paragraph would be your goal to acheive things out of your own comfort zone.
However, more specifically you could make your thesis on either your desire to make new friendships or relationships / or you could make your thesis be about your desire to experience new situations that are out of your comfort zone..
Hope this helps some!