Which sedimentary rock is most likely to have been deposited in a very high energy system

The high energy system of  environment favors the sedimentation of the conglomerate type of sedimentary rock.

Explanation:

The high energy system of environment depicts the condition of the environment where the lakes or seas are shallow favoring the fast movement of water . This leads to the transport of larger grain size of clasts. These larger clasts can be either gravel of big pebble.

Through this transport, when the gradient is steep with velocity being high over flow, forms the conglomerates. On the contrary, fine sized grain are deposited in the condition of low energy environments.