X and Y are two variables whose values at any time are related to each other as shown in Fig. (i). X is known to vary periodically with reference to time as shown in Fig. (ii). Which of the following curves depicts correctly the dependence of Y on time?

1. (a)curve (a) shown in the figure
2. (b)curve (b) shown in the figure
3. (c)curve (c) shown in the figure
4. (d)curve (d) shown in the figure