D - considering the audience
B, I just did it on the exact same site .
Answer:
A
Explanation:
It cannot be B because it has everything correct except it doesn't have a comma separating it.
C is not acceptable either, because there is an unnessasary comma before weekend. It also does not have a period at the end of the sentance.
D has no comma, and no period, so it wouldn't work either.