The soil is ruined by people planting
1. It should be C
2. It has to be B
1.- D, 2.-C
To wreak is to inflict or cause, generally a large amount of damage.
An advocate is someone who publicly recommends/supports a cause or policy. To advocate is to publicly recommend or support any of those.
They usually appear in the body paragraphs.
It means that the door opens by itself, because the prefix "auto" means "by one's self" or "on one's own"