Which is not an advantage of radio telescopes over optical telescopes?
a) radio telescopes are less affected by atmospheric conditions.
b)radio telescopes have better resolution.
c)radio telescopes can operate 24 hours a day.
d)radio telescopes are less expensive.

The correct answer is option B. The radio telescopes have better resolution than optical telescopes.  

This statement is false. Because optical telescopes have better resolution than radio telescopes. A radio telescope is capable of showing only single pixel of the image while optical telescope show the complete image with so many hundreds-thousands pixels in it. 

Ibelieve the answer is d