Answer:
d. an adverse supply shock such as an increase in the price of oil
Step-by-step explanation:
Supply shock is the occurrence of an unexpected event in the economy which impacted negatively on the cost of production and which also causes the short-run aggregate supply curve to shift inward or to the left.
The type of disturbance that shifts the short-run aggregate supply curve inward will give rise to inflation and unemployment because of fall in out and rise in the cost of production..