Answer:
The correct answer is option A, have an observable current
Explanation:
It is the stream pools that have an observable current
Stream pools are basically the water segments found below a water fall, spring or any flowing water form. The pool possess an average speed due to the water entering and leaving with certain speed. Due to the speed of water, water currents are induced in the stream pool. It is usually found at the downstream of any water body where the water speed reduces than the actual while in a pond the water currents remain stagnant and thus there is no observable water current in it.
