You Observed Three Different Star Clusters and Found That the Main-Sequence

You observed three different star clusters and found that the main-sequence turnoff stars in cluster 1 had spectral type A,the main-sequence turnoff stars in cluster 2 had spectral type B,and the main-sequence turnoff stars in cluster 3 had spectral type G.Which star cluster is the oldest?

A) cluster 1
B) cluster 2
C) cluster 3
D) It is impossible to determine their ages given only the spectral types.

Correct Answer:

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