Which of the following sentence includes the element 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 were gaps in his thinking.

The sentence that includes the element 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."

To determine which of the sentences includes the element of vernacular or colloquial language, we need to look for informal expressions or words that are commonly used in everyday conversations.

Let's break down each sentence:

A. "But McCandless never mentioned any romantic entanglements to either Westerberg or Borah."
This sentence does not contain any vernacular or colloquial language. It uses standard English.

B. "Westerberg's latter conjecture, as it turned out, was a fairly astute analysis."
This sentence is also written in standard English and does not include any vernacular or colloquial language.

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 "space cadet" is an example of colloquial language. It is an informal expression used to describe someone who is absent-minded or not focused. Therefore, option C includes the element of vernacular or colloquial language.

D. "Nor was McCandless endowed with a surfeit of common sense."
This sentence does not include any vernacular or colloquial language. It uses formal language.

So, the correct answer is C. The sentence "Alex wasn't a total space cadet or anything; don't get me wrong. But there were gaps in his thinking." includes the element of vernacular or colloquial language.