Final answer:
It is true that a counter-controlled loop's iteration count can be determined by a single variable or an expression in programming.
Step-by-step explanation:
It is true that the number of times a counter-controlled loop will iterate can depend on the value of a single variable or expression. In programming, a counter-controlled loop, like a for loop in many languages, repeats a block of code a specified number of times. This number can be directly set by a variable's value, or through an expression that calculates the number of iterations dynamically.
For example, if we have a variable count set to 5, a loop could be programmed to iterate exactly count times. Similarly, if count was an expression that evaluated to a number based on certain conditions or inputs, the loop would iterate that number of times.