Final answer:
The level of plateau pressure that increases the likelihood of causing lung injury is > 30 cm H2O. When the plateau pressure exceeds this level, it puts excessive strain on the lung tissue, which can lead to injury.
Step-by-step explanation:
The level of plateau pressure that increases the likelihood of causing lung injury is C) > 30 cm H2O. When the plateau pressure exceeds this level, it puts excessive strain on the lung tissue, which can lead to injury. It is important to monitor and maintain plateau pressure within safe limits to prevent lung damage.