Final answer:
The set that is equivalent to a calculator is option D) {calculator, calculator, calculator}.
Step-by-step explanation:
The set that is equivalent to a calculator is option D) {calculator, calculator, calculator}. This is because a set is a collection of distinct elements, and a calculator is a single object. So having multiple calculators in a set does not change the fact that they are all calculators. Therefore, option D, which represents a set with three calculators, is the correct choice.