Figure 12-1 Refer to Figure 12-1

Figure 12-1 Refer to Figure 12-1. A Type II Cepheid has been located in a distant globular cluster with a period of 10 days. What is the star's absolute magnitude?

A) − 1
B) 0
C) − 4
D) − 6
E) The absolute magnitude of a Cepheid variable cannot be determined unless its distance is known.