The Sun Is an Enormous Ball of Gas

Multiple Choice

The Sun is an enormous ball of gas. Left to itself, a ball of so many atoms should collapse under its own tremendous gravity. Why is our Sun not collapsing?

A) the gravity of the planets around the Sun pulls its material outward, preventing collapse
B) the pressure of the corona keeps the Sun's main body of gases confined to a small volume
C) nuclear fusion in the core keeps the temperature and the pressure inside the Sun at a high enough level so that gravity is balanced
D) neutrinos from the core exert an enormous pressure on the layers of the Sun as they travel outward; this pressure is more than enough to keep our star from collapsing
E) you can't fool me, the Sun is shrinking all the time, it just happens very slowly