Choose the correct answer from the options given below
$(b) \rightarrow (iii)$ $\quad F \propto- x$
$(c) \rightarrow (ii)$ Amplitude is constant
$(d) \rightarrow (i)$ $\quad$ K.E. $+$ P.E. $=$ M.E. $=$ constant

$(A)$ $E_1 \omega_1=E_2 \omega_2$ $(B)$ $\frac{\omega_2}{\omega_1}=n^2$ $(C)$ $\omega_1 \omega_2= n ^2$ $(D)$ $\frac{E_1}{\omega_1}=\frac{E_2}{\omega_2}$