What Is Main- Sequence Fitting

What is main- sequence fitting?

A) a way of forcing stars to fit into a standard main sequence, even when they have some unusual characteristics
B) a method for determining the age of a star cluster
C) a method for determining the distance to a star cluster by assuming that its main sequence should line up with the main sequence on a standard H- R diagram
D) the way we construct an H- R diagram by plotting the surface temperatures and luminosities of stars

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