Right answer is (d) Wave travelling along negative y direction
The explanation is: A way of looking at a travelling wave is considering the direction in which a particular value of transverse displacement moves. For the given equation x = Asin(ky+wt+a) we have to see the direction in which x moves. For eg: If we consider the amplitude A, for x =A as t increases, y should decrease. So, we can say that the wave propagates in the negative y direction.
