1. You're looking at just under 50%, so perhaps a C, but there's no knowing for definite until the grade boundaries get released
2. I might be wrong, but I think all of your marks get added up together and as a proportion of the total marks available. Say the whole course is worth 200 marks. Your 19 would be added to paper 1 and paper 2, and worked out as a percentage of 200.
3. No, footnotes, quotes, and bibliography do not count towards your word count