I believe the correct answer is C. a sense of comfort and security.
This is not just any kind of overtaking or conforming or keeping within limits. It means those five nations will function as one, protect their common interests along with protecting each other, and prosper together. Also, the togetherness will make them far more secure. Hence the word "enfold", which also means to wrap up, to hug, to embrace.
In response to the argument that the British have protected the colonies, Thomas Paine argues that while this is technically true, the British have only done so for their own economic gain--not out of a feeling of altruism.

In the English language, the word "who" is almost always used as a pronoun.
It represents a person, similar to the words "I" and "me".
It means that James Franco enjoys doing his job. He doesn’t get stressed or annoyed by his job like he would if he was doing something else. Since he is happy and content with his job, he doesn’t feel the need to take a vacation to get away from his job.
You can summarize that if you want. Basically, the man likes his job lol. ;)