1. Introduce urself
2. Treat them kindly
3. Offer them help
A past participle is a form of verbs that, if formed regularly, has the form of "stem+ed".
The past participle of "tangle" is "tangled" and the sentence with the past participle is:
I stepped into the middle of the tangled vines.
(actually the last sentence also has a past participle in it, but not only, so I am not choosing it).
Your answer would be: Contributed
The answer is C. prescribed to you by a doctor for treating stress
