Final answer:
The correct answer is d) Not determinable from the given information.
Step-by-step explanation:
The question does not provide enough information to determine the rate at which the person is walking away from the streetlight. The height of the person (2 meters tall) does not inform us of their walking speed. Unless additional details are given, such as the distance covered over a specific time period, we cannot calculate the rate of walking.
It's important to understand in problems like these, a person's height has no direct correlation to their walking speed. Knowledge about rates typically involves understanding components of motion such as distance, time, and speed, not physical attributes of a person or object.