What is main-sequence fitting?
A) 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
B) A method for determining the age of a star cluster
C) A way of forcing stars to fit into a standard main sequence, even when they have some unusual characteristics
D) The way we construct an H-R diagram by plotting the surface temperatures and luminosities of stars
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