What Part of the Sun's Aging Process Will Disrupt the Biosphere

What part of the Sun's aging process will disrupt the biosphere and evaporate the oceans of Earth?

A) the fusion of hydrogen in the core
B) an increase in luminosity as the core becomes helium-enriched
C) the expansion of the outer layers of the Sun as a red giant
D) the supernova explosion caused by the collapse of the iron core
E) hydrogen detonation on the white dwarf remnant