The correct answer is <span>b. a mother holding a baby.
Babies could be fragile. Thus, it will require an effort when one is holding a baby in their arms. This is because they should be strong and firm at the same time they should be soft and comfortable for the baby. Also, a mother's touch is different. So the best work done in arms is </span><span>b. a mother holding a baby. I hope that this answer helped you. </span>