A. arguement
Persuasion and propaganda are both biased and one sided. An arguement includes evidence to support the claim therefore making it credible.
I'd say A.
The word "describing" or almost anything ending with "ing" signifies an action occuring now, or in the present. B, C, and D use "when describing" which leads to the assumption that these things listed are taken into account while the landscape is being described but answer choice A uses "when they describe" which is passive rather than active.
