In the context of optimal enzyme conditions, which statement best describes how increasing temperature typically affects enzyme activity for a typical mammalian enzyme?

• A. Activity increases as temperature rises up to an optimum, then decreases sharply at higher temperatures due to enzyme denaturation.
• B. Activity is independent of temperature because enzymes lower activation energy equally at all temperatures.
• C. Activity increases continuously with temperature with no upper limit because reaction rates always accelerate.
• D. Activity decreases steadily as temperature rises because kinetic energy always disrupts enzyme-substrate binding.

Answer: (A)