The correct option is (C) a search of his face showed that he seemed not
She was concerned about how Hank would react to the incident, but in a search of his face showed that he seemed not at all embarrassed or troubled
Grammatical construction is a matching of form and meaning in construction grammar, regardless of the complexity of its formal or semantic structure. Therefore, it is possible to think of words and word classes as examples of constructs.
It would have been better to say "in searching his face, she did not find anything to be concerned about" (if the word "searching" had to be used at all) instead of the underlined sentence because "searching" does not connect with "concerned" (because of the wrong tense). Only option C appears to be the best fit in the particular context because it has a perfectly grammatical construction and pretty clearly communicates the idea. C is the solution, so.
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