Which of the following sentences includes elements of vernacular or colloquial language?

A.
But McCandless never mentioned any romantic entanglements to either Westerberg or Borah

B.
Westerberg's latter conjecture, as it turned out, was a fairly astute analysis.

C.
Alex wasn't a total space cadet or anything; don't get me wrong. But there was gaps in his thinking.

D.
Nor was McCandless endowed with a surfeit of common sense.

C. Alex wasn't a total space cadet or anything; don't get me wrong. But there was gaps in his thinking.

D. Nor was McCandless endowed with a surfeit of common sense.

The sentence that includes elements of vernacular or colloquial language is:

C. Alex wasn't a total space cadet or anything; don't get me wrong. But there were gaps in his thinking.

The sentence that includes elements of vernacular or colloquial language is option C: "Alex wasn't a total space cadet or anything; don't get me wrong. But there were gaps in his thinking."

In this sentence, the phrase "total space cadet or anything" and the use of "gaps" instead of "gaps were" are examples of colloquial language. The use of "don't get me wrong" is also an informal expression that is commonly used in everyday conversation.