Answer B) Now, Jonathan realized that hard work comes in all sorts of shapes and sizes.
A. The answer is A because D and C are incomplete, and B has improper grammar, being there is a comma after the game makes it incorrect.
The right answer for the question that is being asked and shown above is that: "Kennedy believes that the people of that generation have special qualities that will make a difference not only in the country, but also in the world."
He is trying to narrow a general topic by listing subtopics.
Friend, bud, mate, pal, i think