A) His hobbies include drawing, reading, and swimming.
B) When Seth hit the home run, the crowd jumped to its feet and cheered.
C) Irene fixed two dozen chocolate cupcakes, for her aunt, uncle, and cousins.
D) Janice expects her neighbors to pick up her mail while she is out of town.
There doesn't need to be a comma after cupcakes. The sentence should just be written: Irene fixed two dozen chocolate cupcakes for her aunt, uncle, and cousins.