True or False: Explosive decompression does not affect all passengers onboard.

The assertion that explosive decompression does affect all passengers onboard is rooted in the understanding of how decompression works in an aircraft environment. When explosive decompression occurs, there is a rapid drop in cabin pressure, typically due to a structural failure or breach in the aircraft's fuselage. This sudden change in pressure results in a potentially lethal environment if measures are not taken quickly.

In the case of explosive decompression, the pressure difference between the inside of the aircraft and the outside environment can cause turbulence and rapid airflow towards the breach, which can lead to injuries from flying debris, as well as physiological effects on all passengers, such as hypoxia (lack of oxygen) due to the loss of breathable air. Thus, the fundamental nature of explosive decompression is such that it does not discriminate, affecting all passengers and crew in the impacted area.

The other options suggest conditional effects based on altitude or cabin pressure, which do not apply here since explosive decompression inherently involves sudden changes that will impact everyone onboard. Therefore, the situation and its consequences are universal rather than depending on various factors.