Final answer:
The mother's response that indicates she understands safety precautions for her four-month-old infant and four-year-old child is option D) "I have the 4 year-old hold and help feed the four month-old a bottle in the kitchen while I make supper."
Step-by-step explanation:
The mother's response that indicates she understands safety precautions for her four-month-old infant and four-year-old child is option D) "I have the 4 year-old hold and help feed the four month-old a bottle in the kitchen while I make supper." This statement demonstrates that the mother is actively supervising both children while engaging the older child in a helpful and age-appropriate activity. It also ensures that the infant's feeding is done safely under the mother's supervision.