What change, if any, is necessary in the underlined portion in the following passage?
Whether by accident or design, Scott unofficially remained an
independent state for decades after the war. In a symbolic act,
the Tennessee legislature had passed a formal resolution to
readmit Scott to the state in 1986.
A. correct as is
B. unofficially remained an independent state for decades after the war.
In a symbolic act, the Tennessee legislature passed
O C. has unofficially remained an independent state for decades after the
war. In a symbolic act, the Tennessee legislature was passing
D. has unofficially remained an independent state for decades after the
war. In a symbolic act, the Tennessee legislature passed