For finding the distance to M31, Hubble relied upon:
A)RR Lyrae stars in its globular clusters.
B)type I supernova in its core.
C)type II supernova in its spiral arms.
D)Cepheid variables in its spiral arms.
E)planetary nebulae near its core.

Question

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Hubble relied upon Cepheid variables in M31's spiral arms to determine its distance. Hubble relied upon Cepheid variables in the spiral arms of M31 to determine its distance.

For Finding the Distance to M31, Hubble Relied Upon