Which of the Following Is an Example of a Search

Which of the following is an example of a search asymmetry?

A) It is easier to declare that a target is present than it is to declare that a target is absent.
B) It is easier to declare that a target is present in a smaller display than in a larger display.
C) It is easier to find a target that includes a feature than it is to find one that doesn't include the feature.
D) It is easier to find a target using conjunction search than it is to find a target using feature search.