What does the word sensitive mean in this sentence?

there is evidence that youth may be sensitive to nicotine and that teens can feel dependent on nicotine sooner than adults.

defensive

secretive

very delicate

highly responsive

Which is most engaging way of describe how to conduct an interview? a. one of the most common mistakes of interviewers is to ask "force-choice" or "leading" questions. b. although one might be inclined following a script slavishly, one should react to the interviewee's answers. c. remember, you want to encourage the interviewee to talk. avoid asking simple "yes or no" questions. d. the person you are interviewing may provide a number of challenges that can be overcome with care.