What is a primary difference between a while loop and a do/while loop?

A primary difference between a while loop and a do/while loop lies in when the condition is evaluated in relation to the block of code being executed. In a while loop, the condition is checked before the block of code runs. This means that if the condition is false from the start, the code inside the loop will not execute at all. This is particularly useful when you want to ensure that certain prerequisites are met before any processing occurs.

In contrast, a do/while loop guarantees that the code inside the loop will execute at least once before the condition is checked. This characteristic is beneficial when the initial execution of the loop's code is necessary regardless of whether the condition is initially true or false.

Because of this foundational operation, option C accurately captures the essence of how while loops function in evaluating conditions prior to executing their respective blocks of code.