In the Manhattan Distance Approach of Measuring Similarity Between Observations

In the Manhattan distance approach of measuring similarity between observations

A) the distance is measured as the true straight line distance between two points.
B) the distance between two points is a path with right turns as if one is walking a grid in a city.
C) the similarity between two observations is measured with values that represent the minimum differences between two points.
D) the similarity is based on how dissimilar two observations are from each other.