During a nuclear reaction, what is mass converted into?

The mass is converted to energy to cause the mushroom cloud you woud see

Explanation:

fire could start, buildings collapsing, and ash falling from the sky.

explanation:

this is because the buildings or plants could catch on fire and the buildings would most likely collapse. lastly ash would fall because all the burning would cause ash to fall from the sky.

hope this .

i'm assuming that it's c.) red bank..