The answer choice that uses correct punctuation in the passage is:
B. My favorite activities include: reading, writing, and painting. I enjoy these because it helps me relax; I also find them to be very rewarding. Sometimes, when I have extra time, I like to write short stories. They allow me to be creative and express my thoughts.
This option includes appropriate use of colons, semicolons, and commas, and it correctly capitalizes the beginning of the sentence "They."