A. arrest because apprehend means to arrest someone who's done crime.
I believe it is B, it makes the most sense "Although Marvin loves to fish, he seldom gets the chance." Hope this helps!
Well it all depends on what you're writing about. When you write your rough draft think about the feeling it gives when reading it over. Then if it feels right, give it a go. This might not help much but think about how you feel while reading it.
