Figure 12-14(for the Following Questions)

  Figure 12-14(for the following questions)
Examine the accompanying graph. Harlow Shapley did not know that there are two categories of Cepheid variables; he was only familiar with those such as d Cepheii. Because of this, some of the Cepheid variables he observed ____.

A) were dimmer than he expected
B) were brighter than he expected
C) had a longer pulsation period than he expected
D) had a shorter pulsation period than he expected
E) were RR Lyrae variables