About 6,271 people had viewed the video once it had been online for 20 days. The correct option is C.
<h3>What is exponential equation?</h3>
Exponential equation is the equation in which the exponent or part of exponents used as variables.

where, x is the number of days, given that x = 20
Putting the values in the equation

Thus, the correct option is C, 6,271.
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Answer:
According to the U.S. Department of Education, most American colleges and universities award college credit by the semester hour. In order to receive an associate degree, you must earn at least 60 credits, which typically can be fulfilled by completing 20 three-credit courses.