In a series of numbers: 2, 4, 8, 16, ?, 64. What is the missing number?

B. 32

Four friends, A, B, C, and D, are sitting in a row. A is not at either end. B is sitting next to C. D is at one of the ends. Who is sitting in the middle?

A. A

Which number is different from the others?

C. 44

For the input 'sun moon star', what is the correct output after the rearrangement?

A. STAR MOON SUN

A is the son of B. C is the daughter of B. D is the wife of A. How is C related to D?

A. SISTER-IN-LAW