Excerpt from Red Cloud Part B
Charles A. Eastman

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.

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.’
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.

In the underlined section marked number (16) in the passage, there is a mistake in the way the sentence has been written. In order to correct the sentence so that it makes sense and correlates to the rest of the passage t should be written as follows: "His subsequent career would indicate that the lesson was well learned." In this corrected version introduces the pronoun his to clarify who the subject of the sentence is, and it also reorganizes the location of the different clauses of the sentence, so that it is cohesive and understandable for the reader.