The animal that will be able to control its body temperature the best is typically animals with a low surface area to volume ratio.
Animals with a low surface area to volume ratio tend to retain heat better, which helps them maintain their body temperature more effectively in varying environmental conditions. Larger animals usually have this characteristic, allowing them to conserve heat, while smaller animals with a high surface area to volume ratio tend to lose heat more rapidly.
However, it's important to note that endotherms (warm-blooded animals) have even better control over their body temperature than ectotherms (cold-blooded animals) or amphibians, as they can generate their own heat internally. But among the options provided, the low surface area to volume ratio is the most applicable characteristic for effective temperature regulation.