Which human activity decreases the likelihood that flooding will occur? 

A)  channelization 
B)  draining wetlands 
C)  building on floodplains 
D)  removing water-absorbing vegetation

Flooding

An overflow of water onto land that is normally dry, often the result of heavy rain, snowmelt, or obstruction of water flow.

Channelization

The engineering of a natural stream or river by straightening, deepening, or otherwise modifying its natural course for navigation, flood control, or urban development.

Wetlands

Areas where water covers the soil, either permanently or seasonally, supporting distinct ecosystems with a variety of plant and animal life.