(A), strictly speaking is a large town with a corporation and cathedral; but any large town is so called in ordinary speech. In the Bible it means a town having walls and gates.
“The eldest son of the first man [Cain] builded a city (Gen. iv. 17)- not, of course, a Nineveh or a Babylon, but still a city.” —Rawbinson: Origin of Nations, part i. chap. i. p. 10.