What does this means there seem to be a change in the wind regarding nuclear power in the united states fine with me as I'm upwind from the plant. I need this now please

The correct option is A) Butterflies that express two variants of the enzyme are active over a greater range of temperature.

Explanation:

The butterflies which fly most effectively at 29 degrees Celsius produce one type of variant for the particular glycolytic enzyme in the flight muscles. Whereas the butterflies which fly at 40 degrees Celsius produce anther type of variant for the particular glycolytic enzyme in the flight muscles.

The butterflies which are effective at both temperatures i.e 29 degrees Celsius and 40 degrees Celsius can produce both forms of the variant for the particular glycolytic enzyme in the flight muscles.