What is the next letter in the series: A, C, E, G, ?

A. I

Z, X, V, T, ?

A. R

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

A. R

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

B. T

Find the incorrect letter in the series: A, D, G, J, M, P, S

D. P