We Observe a Frog That Carries Its Babies on Its

We observe a frog that carries its babies on its back away from where the eggs hatched. Here are two questions about this observation:
X- Does the frog do this to move the babies to a place where they will be safer and more likely to survive?
Y- Does the frog have specific morphological traits that enable it to hold and transfer its babies in this way?
Which of the two is a proximate question?

A) X, because it considers the adaptive value or function of the trait
B) Y, because it asks about the developmental mechanisms that influence the components of the animal
C) Both X and Y, because they look at the immediate and mechanistic causes of the behavior
D) Neither X or Y, because they both take an adaptive or evolutionary approach to look at the ultimate causes of the behavior