From a tower of height H, a particle is thrown vertically upwards with a speed u. The time taken by the particle, to hit the ground is n times that taken by it to reach the highest point of its path. The relation between H, u and n is

(a) gH = (n – 2)u²

(b) 2gH = n 2u²

(c) gH = (n – 2)2u²

(d) 2gH = nu²(n – 2)