The periods of Type I Cepheids and Type II Cepheids are different for stars of the same luminosity. What is the physical difference between these stars that causes the periods to be different?
A) Type II Cepheids are older, having evolved from Type I Cepheids.
B) The two types have different metallicities.
C) Type I Cepheids are members of binary systems, whereas Type II Cepheids are solitary stars.
D) Type II Cepheids have gone through the helium flash, whereas Type I Cepheids have yet to do so.
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