Which of the following expressions simplifies the calculation of "a/b"?

The correct choice for simplifying the calculation of "a/b" is associated with standardizing the expression through substituting variables. This approach allows for rewriting the expression into a form that can be easier to simplify or manipulate algebraically. By standardizing the variables, it becomes more manageable to work with the expression in various contexts, such as in equations or inequalities, thus making it simpler to derive results or perform calculations.

For instance, if "a" and "b" represent different elements or functions, redefining them using standard forms or consistent variables can provide clarity and maintain consistency throughout mathematical operations. This helps remove ambiguity and can be particularly useful in higher-level mathematics or when dealing with complex equations.

In contrast, the other options do not effectively simplify the expression "a/b." Multiplying "a" and "b" does not yield the value of "a/b" but rather gives a completely different quantity. Creating a ratio, while related to division, does not inherently simplify it either; it simply restates the relationship in a different form. Lastly, using absolute values transforms the numbers but does not assist in simplifying the division itself, as it neither combines nor reduces the expression effectively.