Which observational tool helped astronomers Arno Penzias and Robert Wilson discover the
(CMB)?
A.
optical telescope
B. radio telescope
C. a digital camera
D. space telescope
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A radio telescope helped the astronomers discover the CMB.

Explanation:

Penzias and Wilson while experimenting with a radio telescope in 1964, accidentally discovered the radiation that exists universally also known as the CMB.This was used to support the "Big Bang Theory" and not the "Steady State Theory"CMB is the faint cosmic radiation that fills up the universe. It provides important data for understanding early universe.This data tells us about the composition of the universe and its age which raises new questions about the universe.

Cis the