Why Does Venice,Italy,have Canals for Gondolas and Boats Instead of Normal

Why does Venice,Italy,have canals for gondolas and boats instead of normal streets for cars?

A) It was built on soft muds of a lagoon, and the heavy buildings settled into the mud.
B) The smectite soils in muds under it lead to lateral spreading and subsidence under the load of buildings.
C) The low ground next to the lagoon was a difficult place to provide a good road foundation.
D) Since the city was built about 1,600 years ago, the sea level has risen.
E) Extraction of groundwater below the city caused subsidence of the city below sea level.