Answer:
a. natural law for Josh, and legal positivism for Colin.
Explanation:
Natural law is a concept that seeks to ground law in common sense, rationality, equity and pragmatism. It does not propose a description of human affairs through a formalized theory or law; Nor does it seek to reach the level of descriptive social science. Natural law has, as its project, to evaluate human options in order to act reasonably and well in the conception of the individual. Josh is using the concept of natural law when he believes, based on his own common sense conceptions, that it is correct for him to decide how fast he will have to ride his own car.
On the other hand, legal positivism refers to a set of norms formulated and enforced by human beings. These norms represent an order that must be followed even if it seems unfair and incorrect. This can be seen in Colin's argument that Josh must slow down the car because it is exceeding the speed allowed by law.
