The Stars of a Cluster Are Plotted on an H-R

Multiple Choice

The stars of a cluster are plotted on an H-R diagram. It is seen that the main sequence is well populated at the upper end and that there are many stars above (and to the right of) the main sequence at its lower end. What can be concluded about the age of this cluster?

A) This cluster is very young.
B) This cluster is very old.
C) These characteristics could represent either a very young or a very old cluster.
D) This description is not sufficient to make any conclusions about the age of the cluster.