Final answer:
The correct way to call the function named calculate_sum with two arguments a and b is by using the syntax calculate_sum(a, b).
Step-by-step explanation:
Calling the function involves specifying the function name, followed by the function call operator and any data values the function expects to receive. These values are the arguments for the parameters defined for the function. This process is called passing arguments to the function.
In this case, the correct way to call a function named calculate_sum with two arguments, a and b, is calculate_sum(a, b).
This is assuming that both variables a and b have already been initialized and that the function calculate_sum requires two unnamed arguments.
Generally, in programming, when calling a function with arguments, you provide the values in parentheses directly after the function name, separated by commas if there are multiple values.