When Paul Volcker Became Federal Reserve Chairman in 1979

When Paul Volcker became Federal Reserve chairman in 1979,

A) the rate of inflation was relatively low, and he managed to raise it to 12 percent.
B) the rate of inflation was 12 percent, and he managed to reduce it, but doing so caused a recession.
C) the rate of inflation was already low and stable, but his policies made it lower and more stable.
D) the rate of inflation was 12 percent, and he was not able to bring it down during his time as chairman.