Which of the Following Is Not an Advantage That a Reflector

Which of the following is not an advantage that a reflector telescope has over a refractor telescope?

A) reflectors can be built with much bigger apertures
B) reflectors avoid the problem of chromatic aberration in the lens
C) the device that collects the light is more easily supported in a reflector
D) a reflector doesn't have to deal with the twinkling of the stars, as a refractor does
E) flaws and bubbles in the material inside a thick mirror are not a problem, while flaws and bubbles in the material inside a thick lens are
Section 6.2: Telescopes Today