Choose the Answer Which Best Rewords the Italicized Portion

Choose the answer which best rewords the italicized portion. If you think the original wording is best, choose option A.
-President Johnson authorized the launch of air strikes and Congress approved military force against North Vietnam but he did not declare war.

A) North Vietnam but he did not declare war.
B) North Vietnam. But he did not declare war.
C) North Vietnam; but he did not declare war.
D) North Vietnam, but he did not declare war.