What characteristic of Cepheid variables makes them extremely useful to astronomers?
A) The absolute magnitude of Cepheid variables is related directly to their period of pulsation.
B) The absolute magnitude of Cepheid variables is directly related to their diameter.
C) The absolute magnitude of Cepheid variables is related directly to their metal content (heavy element abundance) .
D) The absolute magnitude of Cepheid variables is related directly to their surface temperature.
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