【单选题】

Many Ph. D. s are out of job because ______.
A) their degree is too high C)they are poor in communication
B) they are of little industrial value to society D) there are too many people unemployed
A．Many Ph. D. s are out of job because ______.

B．their degree is too high
C．they are poor in communication
D．they are of little industrial value to society D) there are too many people unemployed