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

C. SERENE

Choose a word similar to the group: Strong, Sturdy, Robust.

C. POWERFUL

Happy, Joyful, Elated

D. ECSTATIC

Fast, Quick, Rapid

B. SWIFT

Choose a word similar to the group: Fast, Quick, Rapid.

B. SWIFT