or $\frac{\mathrm{dy}}{\mathrm{dt}}=-$ wave velocity $\times$ slope of the wave

$(1)$ For upward velocity, $v_{\mathrm{Pa}}=+\mathrm{ve},$ so slope must be negative which is at the points $D,$ $\mathrm{E}$ and $\mathrm{F}$

$(2)$ For downward velocity, $v_{\mathrm{Pa}}=-\mathrm{ve},$ so slope must be positive which is at the points $A, B$ and $\mathrm{H}$

$(3)$ For zero velocity, slope must be zero which is at $\mathrm{C}$ and $\mathrm{G}$

$(4)$ For maximum magnitude to velocity. $|$ slope $|=$ maximum, which is at $A$ and $\mathrm{E}$. Hence, alternative is wrong.