I think its D because if its a strong topic it will point in to the viewer can be that.
<u>Deductive reasoning: </u>By definition it is when you move from a general statement, such as "<em>All men are mortals", </em>to a more specific statement as <em>"Socrates is a man", </em>through a logical thought process as in "<em>Therefore, Socrates is mortal".</em>
Other example:
"This dog always barks when someone is at the door, and the dog didn’t bark.
" <u>Conclusion:</u> There’s no one at the door.
<u>Counterexample:</u> is an example with a negative connotation. Whereas an example may be used to support or illustrate a claim, a counterexample is used to refute an assertion.
<u>Example:</u>
The assumption that <em>every English word contains at least one vowel.</em> Which is simply not true. One of the more exotic counterexamples is the word nth - of a mathematical origin.
Muir's use of diction in this paragraph, clearly shows how effective his language. The bolded words, like difficult, force, crooked, struggling, etc. create a tense, painful, and frustrating mood. Muir uses these words describe how his journey was through the wading bogs, and swamps and he uses these words to describe what he went through before finding the Calypso Borealis.