Okay. I cannot see the article, again but will try my hardest to answer this anyway.
The purpose can usually be seen in the first sentence or paragraph (unless you have an excerpt). Though it may not be too specific it will usually be backed up by evidence later in the passage. A purpose can always be proven by text details.
Choice of details: should support the purpose
organization: Some things are good for some purposes.
e.g. cause effect, shows the good or bad effects of a purpose. The author can support the purpose or no.
chronological can show how something has changed over time.
etc.
Try to identify the main structure and how the passage is organized and how it supports the main idea.
Fluently
Urgently
Nearby
Outside
Today
Finally
Inside
Carelessly
Honestly
In the crib
<u><em>Hello There!</em></u>
<u><em></em></u>
<u><em>Let's first define what a prepositional phrase is. A prepositional phrase is a bunch of words and these words include a preposition and an object of the pronoun.</em></u>
<h2><u><em>
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<u><em>In this case, the answer would be "D" because 'under' is a preposition so the prepositional phrase would be 'under bridges'</em></u>