The presence of cosmic microwave background radiation is evidence for the Big Bang theory given by scientists. The correct option is D.
The Big Bang theory exemplifies how the universe came into existence from a high density and temperature starting point.
It is the dominant cosmological model that explains the evolution of the observable universe from its earliest known periods to its subsequent large-scale form.
According to scientists, the universe should be filled with radiation that is literally the remnant heat from the Big Bang, which is known as the "cosmic microwave background," or CMB.
Thus, the correct option is D.
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