Final answer:
The equation that best describes the situation is 2n = 24.
Step-by-step explanation:
The equation that best describes the situation is a) 2n = 24.
This equation represents a linear relationship between 2 times the value of n and 24. This means that if we substitute a value for n, the equation will give us the corresponding value of the expression 2n. In this case, when n is equal to 12, the equation becomes 2(12) = 24, which is true.