33. P took a public utility bus in travelling to Baguio. Although P paid her fare, the bus conductor did not issue a ticket to him. Along the way, the bus had an accident causing a slight injury to P and other passengers. If P is to recover damages from the bus owner, the source of the bus owner's liability is:*

(A) contract

(B) quasi-delict

(C) law

(D) quasi-contract

(E) P cannot recover any amount because no ticket was issued.

Brief explanation will help, thanks!