C)
A semicolon is needed after the word tennis in order to join the two sentences correctly
I would say severe. What is the context that you are putting it in?
The answer is...
True.
If you don't, then it's considered to be plagiarism.
Hope I could be of help!
;)<span />
WDYM?
Both Round,
Both bright (to some extent),
Both Celestial,
Both possess Gravity,
Both are symbols to many things...