"The author portrays the <span>character with a few simple traits" would describe a flat character, since "flat" is the opposite of "deep" when it comes to showing different character trains, personality flaws, etc.</span>
The answer correctly identifies the underlined words in
the sentence “To travel to the moon would be a great adventure” is an
infinitive phrase. The answer is letter B. The rest of the choices do not
answer the question above.
Hope I helped.