#Yes we know this.
# This is rule of examination to avoid cheating.
I think the answer may be water pollution.
water pollution > Water pollution<span> is the contamination of </span>water<span> bodies (e.g. lakes, rivers, oceans, aquifers and groundwater). This form of environmental degradation occurs when </span>pollutants<span> are directly or indirectly discharged into </span>water<span> bodies without adequate treatment to remove harmful compounds.
source: Wikipedia </span>
They will start with a relative pronoun, like: that, who, whom, whose, or which, or a relative adverb, like why, where, or when. Adjective clauses function as an adjective and modify nouns and pronouns. They are also called relative clauses.
Answer: B
Explanation:
you are able to imagine the setting of what’s going on. By reading it you picture it in your head.
