The Brightest Stars in a Young Open Cluster Will Be

Multiple Choice

The brightest stars in a young open cluster will be:

A) massive blue stars at the top left on the H-R diagram.
B) red T Tauri stars still heading for the main sequence.
C) red giants that are fusing helium into carbon.
D) yellow giants like our Sun, but much larger.
E) the core stars of planetary nebulae.