Errors in the use of punctuation marks - Comma
the answer is d.
A.What will you be when you grow up-an artist or a mathematician?
B.To make a delicious hot chocolate drink, melt a square of unsweetened chocolate, stir in some sugar and milk, add a dollop of butter, pour the mixture into a mug, and top it off with whipped cream.
C.Here are some remedies you may not know of for treating sunburn: massage in some yogurt, preferably unflavored; cut a raw potato in half and rub it on the skin; or soak a cotton ball in cold tea and dab it on the skin.
D. Last week there was a fire across the street, and the cat ran out, and disappeared!