No Stars Have Been Found with Masses Greater Than 300

Multiple Choice

No stars have been found with masses greater than 300 times our Sun because

A) molecular clouds do not have enough material to form such massive stars.
B) they would fragment into binary stars because of their rapid rotation.
C) they would generate so much power that they would blow themselves apart.
D) they shine exclusively at X-ray wavelengths and become difficult to detect.
E) they are not bright enough to be seen nearby.