In a group of five friends: Alice, Bob, Charlie, David, and Eva, the following conditions apply: 1) Alice and Bob cannot be selected together. 2) Charlie must be selected if Eva is selected. 3) David can only be selected if Bob is not selected. Which of the following groups can be selected?

A. ALICE, CHARLIE, EVA

From the set of items: X, Y, Z, A, and B, the following rules apply: 1) X and Y cannot be selected together. 2) If Z is selected, A must also be selected. 3) B can only be selected if Y is not selected. Which selection is permissible?

A. X, Z, A

Among five animals: Lion, Tiger, Elephant, Giraffe, and Bear, the Lion is heavier than the Bear but lighter than the Elephant. The Tiger is heavier than the Giraffe but lighter than the Lion. Which animal is the heaviest?

C. ELEPHANT

In a selection of four colors from the following: Red, Blue, Green, Yellow, and Purple, the rules are: 1) Red and Blue cannot be selected together. 2) Green must be included if Yellow is included. 3) Purple can only be selected if Red is not selected. Which of the following combinations is valid?

D. BLUE, GREEN, YELLOW

Five friends P, Q, R, S, and T are sitting in a row. P is to the left of Q but to the right of R. S is to the left of T. Who is sitting in the middle?

A. P