How depth of invasion of mud filtrate is related to porosity?

The correct answer to this question is B, Inversely proportional. A proportion is inverse when two variables have a relationship that leads to their product equating to a constant value. In other words, if the value of a variable increase, the other will decrease.

This leads to no change in the result. An example is with the equation y = k/x In the equation, k is constant. Y and X are inverse to each other and the inverse is proportional. A real-life example deals with speed and time. Think when you are in a car. The first you drive, the less time it will take to get to the destination.