If the pattern is A, C, E, G, what comes next?

B. H

What is the 15th letter of the English alphabet?

A. O

Identify the next term in the series: Z, Y, X, W, __?

A. V

Identify the word that can be formed by adding a prefix to the root word 'ACT'.

A. REACT

Which of the following is NOT a valid word formed from the root 'FORM'?

D. DEFORMITY