What is the maximum net quantity of aluminum hydride that may be carried in one package on a passenger-carrying aircraft?

The correct answer is that any amount of aluminum hydride is forbidden on a passenger-carrying aircraft. This restriction is based on the significant hazards associated with aluminum hydride, which is a highly flammable and reactive chemical compound. It poses risks not only due to its potential to ignite but also because it can produce hydrogen gas upon contact with water, creating explosive conditions.

Given the dangerous nature of this material, regulations governing the transport of hazardous materials on passenger aircraft are quite strict. The rules aim to ensure passenger safety and mitigate risks during flight. Therefore, any amount of aluminum hydride is prohibited from being transported in passenger-carrying aircraft, reflecting the high level of caution exercised regarding hazardous substances in aviation.

The other options do not apply because they either suggest a quantity that could still allow for safe transport under controlled circumstances, which is not the case for aluminum hydride, or misrepresent the regulatory stance that strictly prohibits its transport on such aircraft.