Read this sentence from paragraph 2 of The Importance of Sending People to Space.

They cannot make a distinction between unusual and expected observations.

Now read this dictionary entry for distinction.

distinction n. (dih-stingk-shuhn) 1. a feature that sets something apart from something else 2. the state of being different 3. the act of telling different things apart 4. special treatment given based on a difference
Which definition BEST clarifies the meaning of distinction as it is used in the sentence?

A.
entry 1

B.
entry 2

C.
entry 3

D.
entry 4

C. entry 3