kinetics

given that for a reaction of first order n,the integrated form of the rate equation is : k=(1/t(n-1))[1/(C^n-1) - 1/(C₀^n-1)] where c₀ and c are the values of the reactant concentration at the start of time t ...what is the relationship between t_3/4 and t_t/2 where t_3/4 is the time required for c to become 1/4C₀?
a)t_3/4 =t_1/2[2^n-1 +1]
b)t_3/4 =t_1/2[2^n-1 -1]
c)t_3/4 =t_1/2[2ⁿ⁺¹ -1]
d)t_3/4 =t_1/2[2ⁿ⁺¹ +1]