Priya is smoking in her backyard and tosses a cigarette butt on the grass and goes back inside the house. The smouldering butt sets fire to some dry grass and the fire spreads to her neighbour's yard and does $15,000 damage. The neighbour's insurance company pays for the damage and then pursues recovery against Priya. Select the clause under which such recovery will be pursued.

A. Subrogation clause.
B. Apportionment clause.
C. Coinsurance clause.
D. Mortgage clause.