B. is wrong because of the comma after the word 'or' shouldn't be there.
C. is wrong because there should be a comma after the word 'paddleboards' and the comma after the word 'boards' shouldn't be there.
D. is wrong because there should be a comma after the words 'spaghetti' and after 'salad'.
A. is correct
Making pottery, reading books, and playing with my dog are my favorite pastimes.
Hope this helps. :)