A box contains red, blue, and green balls. If the selection criteria are to choose only blue or green balls, which of the following selections is valid?
A group of students consists of John, Lisa, Mark, and Sarah. John is older than Lisa but younger than Mark. Sarah is younger than Lisa. Who is the youngest student?
In a group of five friends: A, B, C, D, and E, the following conditions apply: A is taller than B but shorter than C. D is shorter than E but taller than A. Who is the tallest among them?