Boris Borrowed Martha's Lawnmower to Cut His Grass

Boris borrowed Martha's lawnmower to cut his grass.Boris will be liable for damage to the lawnmower if he:

A) owns a lawnmower and borrowed another from Martha.
B) has not given Martha any consideration.
C) did not use greater than ordinary care to protect it.
D) he failed to notify Martha when he was done with the lawnmower.