Answer:
A. Space in one dimension
Step-by-step explanation:
In Physics, we call dimension to the amount of numbers needed to determine the physical quantity we are measuring.
Thus, we need only one number to know what time is it (one-dimensional problem), but two numbers to know the coordinates of a point on earth's surface: latitude and longitude (two-dimensional problem).
In this case, we need only one number to know the distance between Neo and the Agent, which turns it a one-dimensional problem.