It should be item C.
Ok, let's explain, otherwise it won't be convincing. ...
In the A period, Ai Ai was "describing people who stuttered repeatedly and spoke fluently". It is obviously incorrect to use "expectation" to describe it.
The mutation in item B is used to describe "the situation has suddenly changed dramatically" and cannot be used to describe natural disasters.
Item D stands out from the crowd and is used to "describe a person's appearance or talent as outstanding among a group of people around him" and describe a building as unreasonable.