Read the passage. Look at the underlined section marked number (16). There may be a mistake in the way the sentence is written. If you find a mistake, choose the answer that corrects the mistake. If there is no mistake, choose 'Correct as is.'

Answer: The answer is D on USA test prep. At least that is what the answer was for me.

Assuming this was the passage:

"When he realized, the next instant, that the war whoop was merely the sudden loud whinnying of his own horse, and the charging army a band of fleeing elk, he was so ashamed of himself that he never forgot the incident, although up to that time he had never mentioned it. (16) His subsequent, that the lesson was well learned, career would indicate."

and that you had to choose between:

A) Correct as is.

B) His subsequent career would indicate that the lesson was well learned.

C) His subsequent career, that the lesson was well learned, would indicate.

D) That the lesson was well learned, his subsequent career would indicate.

The answer is: "His subsequent career would indicate that the lesson was well learned" (B).

This is the only answer in which the sentence is understandable in terms of meaning, as well as correct in terms of syntax.

"Career" has to be placed immediately after "subsequent" because the latter is an adjective describing the former. The phrase "that the lesson was well learned" needs to come after the main verb of the sentence, which is " (would) indicate," because "that the lesson was well learned" is what is indicated.