Identify the missing letter in the series: Z, X, V, T, ?

C. Q

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

B. T

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

C. I

A, C, E, G, ?

A. I

Z, X, V, T, ?

A. R