Answer:
Option D, sense organs
Step-by-step explanation:
Since the sense organs of the baby are active, he/she could feel the warmth of the water. He/she could view the bubbles formed in the water which on touching are splashing/bursting. Here the baby is utilizing his/her eyes for seeing the bubbles and hand (skin) to burst them. Since, the baby is able to sense all the pleasures and sensations associated with bathing in warm water, he/she is enjoying.
Hence, option D is correct