Final answer:
In the context of BAQ, the deduction applies to a member with dependents residing in single government quarters when the member's dependents are not living in government quarters.
Step-by-step explanation:
The BAQ deduction applies to a member with dependents residing in single government quarters when the member's dependents are not living in government quarters (option A). BAQ is a type of allowance provided to military members to offset the cost of housing. If the member's dependents are not living in government quarters, the deduction would apply as the member would be receiving housing allowance even though the dependents are not utilizing the quarters.