E, G, I, K, ?

A. M

Complete the series: m, n, o, p, ?

A. Q

Find the missing letter in the series: z, x, v, t, ?

C. Q

What letter comes next in the series: d, g, j, m, ?

A. P

What is the missing number in the series: 3, 6, 12, 24, ?

B. 48