See Figure 12-10 in the Text $\zeta$ Canis Majoris Has an Absolute Magnitude of -2

Multiple Choice

See Figure 12-10 in the text. The star $\zeta$ Canis Majoris has an absolute magnitude of -2.4 and a spectral luminosity class of B2 V. The star $\gamma$ Crucis has a spectral class of M4 and the same absolute magnitude as Canis Majoris. The spectral luminosity class of Crucis is probably

A) M-type white dwarf.
B) M4 II.
C) M4 Ia.
D) M4 V.