Final answer:
The correct response is that both Missouri and Kentucky supported the Union but faced significant internal conflict during the Civil War. The statement that describes the response in the loyal border states of Missouri and Kentucky during the Civil War is: B.
Step-by-step explanation:
The statement that describes the response in the loyal border states of Missouri and Kentucky during the Civil War is: B. The majority of residents supported the Union, but there was significant internal conflict. In Kentucky, the state legislature initially declared neutrality before siding with the Union, and Governor Beriah Magoffin allowed Confederate recruiting within the state.
In Missouri, Governor Claiborne Jackson moved towards the Confederacy, but after violent clashes and a guerrilla war, Union forces gained control and the state remained loyal to the Union throughout the war.