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Along the narrow forest trail, ferns and tiny wildflowers grew. the other options don't have correct punctuation or grammar.
Answer:
A) A man of disreputable nature
Explaination:
The other two option choices are not as formal. This option uses more precise wording, and would be the more formal option of the three.
This suggests that the writer belivies, or want to believe, that dragons could be real or were real.