Grammatically correct: a. The baby is sleeping in peace. b. The baby is sleeping Peacefully c. The baby is sleeping at peacefully. d. The baby is sleeping peace.
Grammatically correct: a. The baby is sleeping in peace. b. The baby is sleeping Peacefully c. The baby is sleeping at peacefully. d. The baby is sleeping peace.
Explanation
The baby is sleeping peacefully:
"Peacefully" is an adverb that correctly modifies the verb "sleeping," describing how the baby is sleeping.