Courts may modify a custody arrangement if:

• A. It is in the best interests of the child
• B. Both parents agree to the modification
• C. The modification is requested within 30 days
• D. It is not allowed to modify

Answer: (A)

The key rule is that custody modifications are allowed only if they would be in the child’s best interests. Courts evaluate what arrangement will best protect the child’s welfare, stability, safety, and emotional well-being, considering factors like the child’s needs, each parent’s ability to meet them, and the home environment. Whether both parents agree or whether a request is filed within a certain time does not by itself authorize a change; if the modification wouldn’t benefit the child, it won’t be granted. So the reason a modification is permissible is that it serves the child’s best interests.