Different we don't look alike, we are ranked differently, one can be higher than one in lets say a job..
1. Introduce the quotation with a complete sentence and a colon.
2. Use an introductory or explanatory phrase but not a complete sentence separated from the quotation with a comma.
3. Make the quotation a part of your own sentence without any punctuation between your own words and the words you are quoting.
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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.
I will organize the columns like this
1 4
2 5
3 6
Themes include: 1, 3, 5
Informative Phrases include: 2, 4, 6