If an atrial septal defect is detected early in life, it is usually not repaired until the preschool ...

B

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A Incorrect. This defect is usually not repaired until the preschool age period, but not because the child's heart needs to strengthen and grow to survive the surgery.
B Correct. If an atrial septal defect is detected early in life, it is usually not repaired until the preschool age period because there is the possibility of a spontaneous closure in the first 2 years of life, and the child is usually asymptomatic.
C Incorrect. This defect is usually not repaired until the preschool age period, but not because parental separation is traumatic for the child, potentially increasing the workload of the heart.
D Incorrect. This defect is usually not repaired until the preschool age period, but not because this gives the parents time to adjust to the idea, and separation for the child is easier.