Arrange the following words and identify the second word: Zebra, Apple, Lion, Monkey.

B. LION

Choose a word similar to the group: Calm, Peaceful, Tranquil.

C. SERENE

A, C, E, G, ?

A. I

Choose a word similar to the group: Happy, Joyful, Cheerful.

C. ELATED

Z, X, V, T, ?

D. U