here's my homework

Complete the sentence by choosing the best answer below, Suppose T(x,y) represents the temperature in a conducting material, then the gradient field VT (x, y) evaluated at a point a) indicates the direction of constant temperature, O b) gives the value of the temperature at that point, O c) indicates the direction in which the temperature increases most rapidly at that point, O d) gives the maximum value of the temperature at that point, Oe) indicates the direction in which the temperature decreases most rapidly at that point