Answer:
D. Basketball, which is my favorite sport, takes a lot of energy.
Commas add a pause, which is necessary in this sentence.
Corrections:
a The flowers that are planted next to the front porch get enough sun.
(take away all commas)
b Our neighbors, for example, have two dogs and a cat.
(add a comma after the word example and take away comma after dogs)
c The squirrel shot out of the back door, across the yard, and up a maple tree.
(add comma after the word door)
Final answer: D.
