The Equation for the Luminosity of a Star in Terms $\sigma$

Multiple Choice

The equation for the luminosity of a star in terms of its surface temperature is L = (surface area) $\sigma$ T⁴ where $\sigma$ is the Stefan-Boltzmann constant. This suggests that when a plot is made of luminosities versus temperature

A) stars of the same temperature but different radii should occupy different points on the plot.
B) all stars should plot along the line.
C) larger stars must have higher temperatures.
D) smaller stars must have higher temperatures.