4 At the bottom of Barracuda Lake A the water is very cold. B you can see fish. Cit is difficult to see in the water. D the water is very clear.

В тексте говорится: "There isn't a lot to see at the bottom of the lake as the water is dark and murky", что означает, что на дне озера Барракуда видимость плохая, следовательно:

Cit is difficult to see in the water.