The dark cloud was like a stain of darkness over the wide-open plain.
(Is that too advanced?)
There was a red stain on the boy's shirt as he stood in the grassy plain.
(That's a bit simpler.)
The right answer for the question that is being asked and shown above is that: "It adds to the high standard the speaker is claiming one must meet to love another."In this excerpt from “A Woman’s Shortcomings” by Elizabeth Barrett Browning, this is the effect of parallelism
An effective argument includes both, because you have to present your opinion on the topic and then utilize facts to explain your reasoning.
Air pollution is affecting the environment in negative ways.