When the Stars of the Following Open Clusters Are Plotted $\chi$

Multiple Choice

When the stars of the following open clusters are plotted on an H-R diagram, the absolute magnitude values for the turning points are approximately: Coma (2.4) , h + $\chi$ (-2) , M67 (4.5) , and Pleiades (0.3) . Which cluster is youngest?

A) Coma
B) h + $\chi$
C) M67
D) Pleiades