When it comes to understanding the calculation of average acceleration, we must only consider the change in acceleration and the amount of time it took for this change to happen.
Now, let's look at the formula.
Average acceleration is defined as the change in acceleration divided by the time it took for that change to occur. In mathematical terms, this can be written as (Final Acceleration - Initial Acceleration) / Time.
What we are looking at here is the difference between the final and initial acceleration, which gives us the total 'change' in acceleration. This difference is then divided by the time period to find out the average acceleration over that span of time.
Therefore, from the given choices, the formula to calculate the average acceleration when the initial acceleration, final acceleration, and time are provided would be (Final Acceleration - Initial Acceleration) / Time.
Hence, the correct answer is option B.