Select the best version of the underlined part of the sentence. The first choice is the same as the original sentence. If you think the original sentence is best, choose the first answer.
(Jupiter with its numerous moons, and Great Red Spot,) has been studied extensively by astronomers.
a. Jupiter with its numerous moons, and Great Red Spot,
b. Jupiter, with its numerous moons and Great Red Spot,
c. Jupiter with, its numerous moons, and Great Red Spot,
d. Jupiter with, its numerous moons and Great Red Spot,