It can mean that you can get what you want easier when you're being nice.
Answer:
they are all married
Explanation:
there isn’t a single person on board. It is possible because the boat is filled with people, who are not single. It denotes the marital status of everyone. So the people who all are present in the boat are not single; they are married.
Out of your 3 possible answers, B. ones' is the correct one and I will explain why. Answer A is a contraction of one and is. When you put "one is" into the blank space you can tell that it is not right. Answer C is incorrect because when you place an apostrophe after an s it is implied that there should be another s that follows and so you do not need to put it there. This means that answer B is correct since it doesn't have the extra s.