Answer
Answer Choice $C$
Work Step by Step
There are $365$ days in a year, $24$ hours in a day, and $60$ minutes in an hour.
We can multiply $400 \times 20 \times 60\times 8$ to get an estimation.
$400 \times 20 \times 60\times 8=3,840,000$
The closest answer to that is $\boxed C$.
