In or -between hazards are related with excavations [trenches]; therefore, the hazards considered to be the greatest risk is:

The hazards considered to be the greatest risk is caught in or-between hazards.

Explanation:

In ‘caught in or-between’ hazards, important body parts are highly vulnerable to the risk of getting cut or completely disabled if proper safety measures are not put to use.In most cases of these hazards, the only treatment that can be done after the accident is that of amputation.Hence, it is utterly necessary to plan the work well in advance, be highly alert and attentive throughout the process of the work, and implement all the safety measures required.