It Is Difficult to Improve the Angular Resolution of Optical

It is difficult to improve the angular resolution of optical telescopes located on the surface of Earth beyond a certain limit because:

A) large telescopes are always reflecting telescopes, and they suffer from too much chromatic aberration.
B) spherical mirrors suffer from too much aberration.
C) star images are distorted more by air turbulence than by the telescope optics.
D) improvement would require much larger, very expensive telescopes to enhance the inherent telescope.

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