In Some Binary Star Systems,such as β Lyrae,essentially No Light

In some binary star systems,such as β Lyrae,essentially no light is seen from the more massive star because the:

A) more massive star is hidden by an accretion disk of material from the less massive star.
B) orbit of the more massive star keeps it hidden behind the larger but less massive star as seen from Earth.
C) more massive star is a black hole from which light cannot escape.
D) more massive star is still hidden in the dust clouds from which it formed.