Trevor dropped a bit of olive oil on the kitchen floor while he was cooking. Later, his mother slipped on the spot where he dropped the oil and fell.

What can Trevor infer based on his observations?
A.
The oil reduced the friction between the floor and his mother's foot.
B.
Trevor's mother slipped on the spot where he dropped the oil.
C.
Olive oil can be used as an adhesive between two solid objects.
D.
The oil increased the gravitational force on his mother's foot.