Identify the missing term in the series: 1, 1, 2, 3, 5, ?

B. 8

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

B. S

A, C, E, G, ?

A. I

M, O, Q, S, ?

B. T

Find the missing number in the series: 5, 10, 20, 40, ?

A. 80