We can actually see that the quote from the passage that is an example of direct characterization is:
"He looked around inside the engine for about ten minutes and then wiped his face absentmindedly so that the grease-stained his cheek." Thus, option "D" is correct.
Direct characterization refers to the literary device that is employed by authors or writers to reveal the conclusive details of a character with no ambiguity. The details of a character is seen clearly and directly.
Thus, from the passage, we can see here that the quote that is an example of direct characterization is "He looked around inside the engine for about ten minutes and then wiped his face absentmindedly so that the grease-stained his cheek."
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