Unexpected rise means sudden -> increase in sales.
Aggregate demand is total -> market demand.
Unplanned accumulation means extra -> stock stored.
Unplanned depletion means less -> stock left.
Normal profit is average -> expected gain.
Aggregate demand would decline: no effect
There will be unplanned accumulation of inventories: no effect
There will be unplanned depletion of inventories: yes effect
Normal profit would be lower: no effect
Answer is 3 because sales -> rise means less stock.