Which explosive agent is considered the most available?

The most available explosive agent among those listed is ANFO. ANFO stands for Ammonium Nitrate Fuel Oil, which is a widely used explosive in mining and construction due to its cost-effectiveness and ease of manufacture.

ANFO consists of ammonium nitrate, a common fertilizer, and fuel oil, making it both economical and readily accessible. It is favored in large-scale applications because it can be produced in bulk, is stable, and is relatively safe to handle and transport compared to more sensitive explosives like nitroglycerin or RDX.

While TNT, RDX, and nitroglycerin have specific applications within military or demolition contexts, they are not as widely produced or utilized as ANFO, which holds a prominent position in commercial explosives. This accessibility and availability make ANFO the correct choice in this context.