According to the information in the above graphic:

a. when insect wings became aerodynamically beneficial, they lost their thermoregulatory benefits.
b. when insect wings became beneficial for thermoregulation, they lost their aerodynamic benefits.
c. insect wings originally conferred thermoregulatory benefits on the organisms that possessed them and later, as they enlarged, began to confer aerodynamic benefits on those organisms.
d. insect wings originally conferred aerodynamic benefits on the organisms that possessed them and later, as they enlarged, began to confer thermoregulatory benefits on those organisms.
e. at all points in insect evolution, the aerodynamic characteristics of wings conferred a greater benefit than the thermodynamic characteristics.