In a sequence where each letter is followed by the next letter in the alphabet, what is the 5th letter after 'M'?

A. R

Identify the pattern: A, C, E, G, I, ?

A. K

If the pattern is to add 3, then subtract 1, starting from 1, what is the 6th term?

A. 10

What is the root word in the word 'unhappiness'?

A. HAPPY

What is the 15th letter of the English alphabet?

A. O