Answer: prevent
-obstructing
-refusing
Step-by-step explanation:
Connotation refers to the feelings or the idea which a particular word evokes. It should be noted that while a positive connotation, evoke warm feelings, the negative connotation gives a less pleasant feeling or bad vibes.
Negative connotation refers to the bad feeling which people get when they hear a particular word. From the excerpt, the words with negative connotations include prevent, obstructing and refusing.