Aggregate demand is -

Negatively related to the price level because a decline in the price level has a negative effect on the demand for output

Negatively related to the price level because a decline in the price level has a positive effect on the demand for output.

Positively related to the price level because a decline in the price level has a negative effect on the detailed for output.

Positively related to the price level because a decline in the price level has a positive effect on the demand for output.