Answer: A. Major key
Explanation: A major key is often associated with feelings of happiness, joy, and positivity. It creates a bright and uplifting mood that can enhance the romantic atmosphere of the scene. The major key's characteristic sound, with its intervals and harmonies, can evoke a sense of warmth and serenity, complementing the idyllic setting of a beach on a paradise island.
By using major chords and melodies, the music can convey the beauty and enchantment of the surroundings, as well as the excitement and anticipation of a budding love story. It can capture the listener's attention and immerse them in the blissful atmosphere of the beach, setting the stage for a romantic tale to unfold.