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The broadnose sevengill shark and the Pacific halibut are ectothermic (cold-blooded) fish, whereas the salmon shark and the Albacore tuna are regional endotherms—they retain metabolic heat resulting in body temperatures above the ambient water temperature. Modeling the effect of falling ambient temperatures on ectotherms indicated to researchers Haley R. Dolton and colleagues that ectotherms’ body temperatures inexorably decrease toward the ambient temperature. Data from wild basking sharks show that even though their body temperature consistently remains 1.0 to $1.5^{\circ }\mathrm{C}$ above ambient, it also declines as the ambient temperature falls. This suggests that the body temperatures of the       

Which choice most logically completes the text?

A

Albacore tuna and the salmon shark are likely to be more variable than the body temperature of the basking shark.

B

Pacific halibut and the basking shark are at least partly determined by the ambient water temperature.

C

basking shark and the salmon shark remain fixed even as ambient water temperature changes, while the body temperature of the Pacific halibut changes with variations in the ambient water temperature.

D

basking shark and the Albacore tuna remain fixed even if the ambient water temperature changes, while the body temperature of the broadnose sevengill shark varies even if the ambient temperature is stable.