Compared with the Composition of the Early Sun, the Composition

Compared with the composition of the early Sun, the composition of the gas at the core of a star that has just become a red giant is

A) very different, since thermonuclear fusion has transformed all the hydrogen and helium into heavier elements.
B) very different; there is lots of hydrogen but almost no helium left after thermonuclear fusion.
C) very different, since thermonuclear fusion has transformed all the hydrogen into helium.
D) the same, with a higher fraction of hydrogen than helium since these stars were produced with the same initial material.