Whats the molecular makeup of stratotopic molecular breakup of a meltdown of a nuclear reactor?

It consists of a mixture of nuclear fuel, fission products, control rods, structural materials from the affected parts of the reactor, products of their chemical reaction with air, water and steam, and, in the event that the reactor vessel is breached, molten concrete from the floor of the reactor room.

Explanation:

i think the answer would be d