How Do Modern Telescopes Prevent Problems of Earlier Telescopes That

How do modern telescopes prevent problems of earlier telescopes that limited mirror size and stability during temperature changes?

A) They only use telescopes in space to avoid the atmosphere.
B) They use a digital imaging system and process the image to remove distortions.
C) They use a mirror that is constantly adjusted in shape to adjust for changes in atmospheric distortions.
D) They use a super refraction system that uses a series of small lenses that avoid chromatic effects to collect more light than previously possible.