Suppose Real Output Falls in the Aggregate Economy

Suppose real output falls in the aggregate economy. Which is correct?

A) A real business cycle theorist thinks that there was a negative shock to total factor productivity, and that the government should therefore increase expenditures.
B) A New Keynesian thinks that the output gap has fallen, and central bank's interest rate target should rise.
C) A real business cycle theorist thinks that total factor productivity has risen, and that the government should do nothing .
D) none of the above.