What process is necessary for a star with twice the Sun's mass to become a carbon star?

Question

Quizplus · Accepted Answer

A star with twice the Sun's mass has enough gravitational pressure and temperature to undergo carbon fusion in its core, producing carbon as the end product. As the star ages, convection currents bring the carbon produced in the core to the surface, where it is visible as a carbon star. This process is called dredge-up. Options B and C refer to the helium flash, which occurs during the late stages of a low-mass star's life, and is not applicable to a star with twice the Sun's mass. Option D is incorrect because nuclear fission typically involves heavier atomic nuclei being split into smaller ones, and cannot produce carbon from magnesium.

What Process Is Necessary for a Star with Twice the Sun's