Final answer:
The correct answer is 'A. evinces; impetuous,' which completes the sentence by indicating that Ben's decision to become a daredevil pilot clearly shows his tendency to act without thoughtful consideration.
Step-by-step explanation:
The question is asking to fill in the blanks in a sentence that describes something characteristic of a person named Ben. The sentence is structured to indicate that Ben has a particular tendency that is exemplified by a subsequent decision he made. The correct fill-ins for the sentence should be words that fit the context both in meaning and grammatical structure. Based on the provided choices, A. evinces; impetuous fits best as 'evinces' means 'to show or demonstrate clearly' and 'impetuous' refers to acting quickly without thought or care.
By using these words, the sentence reads: 'Nothing evinces Ben's tendency to act without thinking more than his impetuous decision to become a daredevil pilot.' This sentence means that Ben's decision, made on the spur of the moment, clearly shows his inclination to take actions without deliberation.