What letter comes next in the series: z, x, v, t, ?

A. S

What comes next in the series: M, O, Q, S, ?

B. T

Find the odd one out in the series: A, C, E, G, I, K, M

D. M

What number should replace the question mark in the series: 1, 4, 9, 16, ?

B. 25

Identify the missing number in the series: 2, 5, 10, 17, ?

B. 25