Which of the Following Statements Describing a Disadvantage of Large

Which of the following statements describing a disadvantage of large refracting telescopes when compared with large reflecting telescopes is NOT correct?

A) Sagging of the primary optical element under its own weight is a problem with refracting telescopes but not with reflecting telescopes.
B) Refracting telescopes suffer from chromatic aberration, whereas reflecting telescopes do not.
C) Refracting telescopes can suffer from spherical aberration, whereas reflecting telescopes cannot.
D) Air bubbles in the glass are more of a problem in refracting telescopes than in reflecting telescopes.