The Star ? Pegasi (In the Constellation Pegasus, the Flying

Multiple Choice

The star ? Pegasi (in the constellation Pegasus, the Flying Horse) has a spectral luminosity class of B8 V, giving it a surface temperature of about 12,000 K. According to Table 19-1 of Universe, 11th ed., the expected main-sequence lifetime of ? Pegasi is:
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A) about 400,000 years.
B) about 400 million years.
C) much greater than 800 million years.
D) not defined in any way by the above information.