Which of the following statements correctly describes competitive inhibition?

• A. A competitive inhibitor binds to the substrate and inhibits it from binding to the active site of the enzyme.
• B. A competitive inhibitor binds to a site other than the active site and inhibits the substrate from binding.
• C. A competitive inhibitor binds to the active site and degrades the enzyme.
• D. A competitive inhibitor binds to the active site of an enzyme and inhibits the substrate to bind.