Answer: answer B is incorrect
Explanation:
A line can be named by any two points on the line, and the order does not matter. Line JK is the same al line KJ.
The line can also be named by one letter, usually lower case. In this picture, the line is line 'n', and that answer is acceptable.
What you cannot do is name a line by just one point, as answer B tries to do.
There are an infinite number of lines possible through any given point, so one point is just not enough.
Hope this helps!