What is inversion?

A)harmful and causing damage
B)the situation of things being out of order, or upside-down
C)a molecule made up of three oxygen atoms
D)to cause something to fade or disappear
E)a particular place

B) the situation of things being out of order, or upside-down.

In grammar, inversion refers to a change in the usual word order of a sentence, such as placing the subject after the verb or inverting the order of a verb and its subject.

B) The situation of things being out of order, or upside-down

Inversion refers to the state or situation in which things are arranged or placed in the opposite order from what is typical or expected. It can also refer to a reversal, change, or flipping of the usual or conventional order.