What have astronomers detected that is related to the cooling and expansion of the universe?
A. colliding galaxies
B. lots of distant white dwarfs
C. the Cosmic Microwave Background Radiation
D. a supermassive black hole in the center of our galaxy

C.

Explanation:

It's radiation from the birth of the universe.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

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