The Sketch Above Shows Groups of Stars on the H-

The sketch above shows groups of stars on the H- R diagram, labeled (a) through (e) ; note that (a) represents the entire main sequence while (c) and (d) represent only small parts of the main sequence. Which group represents stars that are extremely bright and emit most of their radiation as ultraviolet light?

A) a
B) b
C) c
D) d
E) e