It would be
A. the dashes Dickinson uses
Hope this helps
4/10 pencils are red. I'm not sure what you mean by write two equivalent fractions but 4/10 and 8/20 as the equivalent amount of red pencils/total amount of pencil
I'm assuming that the words from the excerpt (which you didn't provide, by the way) that suggests that Claudius plans to control Hamlet is C. fetters.
The reason why I'd choose that word is because fetters are chains or shackles used to restrain someone.