Why Is the Angular Resolution of a 20-M-Diameter Radio Telescope

Why is the angular resolution of a 20-m-diameter radio telescope worse than that of a 0.5-m-diameter optical telescope?

A) The ratio of wavelength to telescope diameter is larger for the radio telescope.
B) It is difficult to make a radio dish sufficiently smooth to reflect radio waves.
C) Atmospheric turbulence disturbs radio waves more than it does visible light.
D) The ratio of wavelength to telescope diameter is smaller for the radio telescope.

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