After It Experiences a "Helium Flash" a Star Like the Sun

After it experiences a "helium flash" a star like the Sun will have a brief period of stability, fusing helium into carbon (and sometimes oxygen) . During this brief stable stage, the star

A) gets to be even larger in diameter than it was as a red giant
B) returns to the position on the H-R diagram that the star had in its main-sequence stage
C) increases tremendously in luminosity
D) is able to fuse many of the heaviest elements (such as iron and gold) in its superhot core
E) none of the above