In a family of six members A, B, C, D, E, and F, there are two married couples. A is a teacher and is married to B. C is a doctor and is married to D. E is the son of A. Who is the daughter of C?

D. F

Five tasks P, Q, R, S, and T need to be completed. P must be done before Q but after R. S must be done before T. What is the correct order of tasks?

B. R, S, P, Q, T

Five people P, Q, R, S, and T are sitting in a line. P is to the left of Q but to the right of R. S is to the right of T. Who is sitting at the extreme left?

C. R

A, B, C, D, and E are five students who submitted their projects in the following order: A submitted before C but after B. D submitted before E but after A. What is the correct submission order?

A. B, A, C, D, E

Three friends X, Y, and Z have different pets: a dog, a cat, and a bird. X does not have a dog. Y has a bird. Who has the cat?

C. Z