I don't care how good the plot is, if you have bad grammar I will stop reading. As a person who plans on being an English teacher, it kind of hurts. :)

I voted for A but actually idk :/
Like.. I'd love a good plot and grammar, but sometimes those with bad grammar and good plot are also good actually ouo

AT LEEAAST a good plot and vocabulary.

You can have all three you know... That's what beta's are for :)