Answer with explanation:
Graph Drawn by Pauley
When Pauley graph the change in temperature of a glass of hot tea over time. He sees that the function appears to decrease quickly at first, then decrease more slowly as time passes.
Suppose , Change in Temperature = X - Axis
Time =Y-Axis
Since, Rate of Decrease or Increase is not Constant throughout.That is if you will try to find out the slope at any point on the curve, it will not be same.So, it can't be a Linear function.
Also, Linear function is either Increasing or Decreasing.
Option D:
It is nonlinear because linear functions increase or decrease at the same rate.