In which river zone are plants that are adapted to attach to rocks mostly found? 

A)  in the source zone 
B)  in the transition zone 
C)  in the limnetic zone 
D)  in the floodplain zone

River Zone

The area or region surrounding a river, including its banks and adjacent land, which can play critical roles in ecosystem function and biodiversity.

Source Zone

The specific location or area where pollutants originate and from which contamination spreads to surrounding environments.

Transition Zone

An area or region where two or more distinct habitats or ecosystems meet and integrate, often rich in species diversity.