Bob Owns a Business Delivering Coffee and Donuts Within the Downtown

Bob owns a business delivering coffee and donuts within the downtown area of the city. Smith Co. calls him to deliver a large quantity of his products to their local office. While taking a coffee urn through the Smith Co.'s office, Bob drops it on Lester, scalding him. Who is liable?

A) Smith Co. and Bob are liable.
B) Bob alone is liable.
C) Lester has to absorb the cost himself since he assumed the risk by working at Smith Co.
D) Only Smith Co. is liable.