If M + N means M is the father of N, M - N means M is the daughter of N, and M × N means M is the son of N, what is the relationship of O if M + O - N?

A. O IS THE DAUGHTER OF N

Complete the series: a, e, i, o, ?

A. U

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

A. I

In a class, there are three types of students: A, B, and C. Type A students are good at mathematics, Type B students are good at science, and Type C students are good at literature. If John is a Type A student and Sarah is a Type B student, which of the following statements is true?

C. JOHN IS NOT GOOD AT LITERATURE

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

A. 4157