A and B are only different if “motivation” is not an innate factor. But what else would it be? Is it even an actual thing, or just a name for a phenomenon, masquerading as an explanation of the phenomenon?
(A) and (B) make different predictions. If (B) is true, people with high IQ will not be particularly good at a new task when they try it for the first time—but then they would improve by application. If (A) is true, people with high IQ will be immediately good at new cognitive tasks (or, at least, much better than people with low IQ).
A and B are only different if “motivation” is not an innate factor. But what else would it be? Is it even an actual thing, or just a name for a phenomenon, masquerading as an explanation of the phenomenon?
(A) and (B) make different predictions. If (B) is true, people with high IQ will not be particularly good at a new task when they try it for the first time—but then they would improve by application. If (A) is true, people with high IQ will be immediately good at new cognitive tasks (or, at least, much better than people with low IQ).