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

A. REFORM

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

D. ACTUALITY

From the root 'SCRIBE', which of the following is a valid derivative?

B. SUBSCRIBE

If A is to B as C is to D, and A = 2, B = 4, C = 3, what is D?

A. 6

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

A. R