Select the option that can be used as a one-word substitute for the highlighted segment.
The music filled the room with a lot of happiness, expressing joyful melodies that brought smiles to everyone's faces.

Correct option is B

The correct one-word for the highlighted group of words is (b) joy.
Joy: A feeling of great happiness or delight. (आनंद, हर्ष)
Example: The room was filled with joy as the children opened their gifts.
Meanings of the given other options:
· (a) Surprise – a sudden event causing amazement (आश्चर्य)
· (c) Excitement – state of being emotionally stirred (उत्तेजना)
· (d) Fear – feeling of anxiety or dread (डर)