If M is the brother of N and N is the sister of O, what is O's relationship to M?

D. SIBLING

If 'CAT' is coded as '3120', what is the code for 'DOG'?

A. 4157

A group consists of Anna, Ben, Clara, and Derek. The selection criteria are: Anna cannot be selected if Ben is selected. Clara can only be selected if Derek is also selected. Which pair can be selected together?

B. CLARA AND DEREK

What is the code for 'HELLO' if 'H' is coded as '8', 'E' as '5', 'L' as '12', and 'O' as '15'?

A. 851215

In the sequence 5, 10, 15, 20, 25, 30, how many times does the number 15 occur?

A. 1