When Their Friend Vincent Was Walking Down the Hall After

When their friend Vincent was walking down the hall after a pleasant conversation,Neil and Michaela watched as he suddenly tripped and fell to the floor,scattering his schoolbooks all over the hallway.They ran over to him,helped him pick up his books,and commented,"I didn't know that the floor was so slippery in this part of the hall!" Neil and Michaela have made a _____ attribution to explain why Vincent fell over.

A) dispositional
B) assistive
C) situational
D) cooperative