Why was it so important for Abraham Lincoln to keep the border states neutral? Group of answer choices

they would help the south if they joined

they were close to Washington DC

they had lots of supplies

all are true

They were close to D.C

Explanation:

If these border states fell, the Cinfederates would have an open border of D.C. from Virignia and the border states and it wouk of made the  effort of defending Washington D.C. much harder.

c

explanation:

i need the diagram.