Star a Is a Main Sequence Star of Spectral Type $\mathrm { F 2}$

Multiple Choice

Star A is a main sequence star of spectral type $\mathrm { F 2}$ ad star B is a white dwarf of spectral typeB4. Which statement below is correct?

A) Star A appears brighter than star B.
B) Star B appears brighter than star A.
C) Star A is hotter than star B.
D) Star B is hotter than star A.
E) None of the above can be said about these two stars.