A particle is released from rest from a tower of height 3h, the ratio of time of fall for equal heights h ie $t_1:t_2:t_3$ is

Question

$$(a)\;\sqrt 3:\sqrt 2:1 \quad (b)\;3:2:1 \quad (c)\;9:4:1 \quad (d)\;1:(\sqrt 2-1):(\sqrt 3-\sqrt 2)$$