Hormones can bring about substantial physiological changes at very low concentrations. How does this relate to the concept of second messenger systems?

• A. Second messenger systems act more quickly, creating a larger cellular response.
• B. Second messenger systems modify the DNA directly, allowing the hormone to make an impact even at low concentrations.
• C. Second messenger systems prevent hormones from being degraded so they can exert their effect for a longer duration.
• D. Second messenger systems amplify the original hormone signal, allowing it to work at low concentrations.