Five Stars and Their Spectral Types Are Given Below $\alpha$ For; F8)
B) (O Cet; M7)
C) 35 Ari; B3

Five stars and their spectral types are given below. Which star would have the lowest surface temperature?

A) ( $\alpha$ For; F8)
B) (o Cet; M7)
C) 35 Ari; B3
D) ( $\gamma$ Tri; A0)
E) (F Per; O7)