Why Is Jupiter Denser Than Saturn

Why is Jupiter denser than Saturn?

A) It is made of a different composition than Saturn, including a higher proportion of hydrogen compounds and rocks.
B) The extra mass of Jupiter compresses its interior to a greater extent than that of Saturn.
C) Its core is much larger than Saturn's.
D) It has a greater proportion of helium to hydrogen compared to Saturn.
E) Scientists do not know why this is so.