Why Is the Hyades Cluster Important for Building Up a Catalog

Why is the Hyades Cluster important for building up a catalog of the true luminosities of main-sequence stars?

A) It is an extremely bright star cluster.
B) It is close enough to us that the distance to its stars can be found by stellar parallax.
C) It is an old globular cluster whose age we can determine very accurately by measuring its main-sequence turn-off point.
D) It's a cluster that has been photographed over many decades, so we know how the stars vary in brightness.
E) It contains many Cepheid variable stars that can be used to determine its distance.