please answer

In 2021, the economy of Westlandia has the following macroeconomic values: Y = 1000, C = 500, IP= 400, NX = 0, G = 0. Which of the following is true? . a. Firms will produce less output as they build up unplanned inventory. b. Firms will produce less output as unplanned change in inventory is negative. c. Firms will produce more output as unplanned change in inventory is negative. d. Firms will produce more output as they build up unplanned inventory