Relative to a Sunlike Star, How Should the Region Where

Relative to a sunlike star, how should the region where convection dominates be different within a cooler star?

A) Convection should dominate within a smaller fraction of the star's surface.
B) Convection should dominate within a larger fraction of the star's surface.
C) Convection should dominate within a smaller fraction of the star's core.
D) Convection should dominate within a larger fraction of the star's core.