The fact that Fahrenheit 451 by Ray Bradbury, a book about banning books.
has itself been banned in a few schools is an example of which of the
following types of irony?
verbal
dramatic
situational
neither

Answer is most likely situational irony.

For reference, here is the definition of situational irony: irony involving a situation in which actions have an effect that is opposite from what was intended, so that the outcome is contrary to what was expected.

she swerves to avoid the turtle.