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Butterflies of the genus Colias live in the Rocky Mountains, where they experience a wide range of temperatures. Different variants of a particular glycolytic enzyme in the flight muscles are optimally active at different temperatures. Within the same population, some individual butterflies fly most effectively at 29°C , while others fly most effectively at 40°C. Still others can be equally active at both temperatures. Which of the following claims is most consistent with the observed butterfly behavior?AButterflies that express two variants of the enzyme are active over a greater range of temperature.BButterflies that are active over a wide range of temperatures produce greater amounts of the enzyme.CTemperature has little effect on the activity of butterflies.DButterflies that are active at warmer temperatures produce more offspring.

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