(અત્રે આકૃતિઓ ફકત રેખાકૃતિ સૂચવે છે અને તે એક જ સ્કેલ પર દોરેલ નથી.)
$v^{2}=2 g h$
$v \frac{d v}{d h}=2 g=c o n s t$
$\frac{d v}{d h}=\frac{c o n s t a n t}{v}$
Here we can see slope is very high when velocity is low therefore at Maximum height the slope should be very large which is in option $3$ and as velocity increases slope must decrease there for option $3$ is correct.