Final answer:
The regulator molecule that binds to an enzyme to activate or suppress it, doing so at a location that is not the active site, is called an allosteric regulator.
Step-by-step explanation:
If a molecule binds to an enzyme to activate or suppress that enzyme, this regulator would be considered allosteric. Allosteric regulation involves molecules that bind to an enzyme at a location other than the active site, which is referred to as an allosteric site. This binding leads to a conformational change in the enzyme that either increases (allosteric activator) or decreases (allosteric inhibitor) the enzyme's activity. Competitive inhibitors, on the other hand, bind directly to the active site, competing with the substrate. Therefore, the correct answer to the question is A. Allosteric.