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

B. SUBSCRIBE

What is the 21st letter of the English alphabet?

A. U

If 'HELLO' is coded as 'IFMMP', what is the code for 'WORLD'?

A. XPSME

In the sequence 2, 4, 8, 16, what is the next number?

C. 32

If the letter 'X' is the 24th letter of the alphabet, what is the letter that comes immediately before it?

A. W