For the first red, you don't need an article before "relationship".
When you're saying "type of [word]", do not put any article before that word.
Example: "a type of device"
Not too sure about the "your back" parts. It could be your teacher does not like repition.
Also not too sure about "did". He probably wanted you to use the word "felt" instead of "did feel"
The first word of the last paragraph should be "in" not "at".
The red commas definitely do not need to be there.
Don't know why he marked "time to" and "to" red.
Answer: The element of Logos
Explanation: Logos is one of the three Aristotle's elements of good communication, it consists on the reliability that you have as a person, due to the logic of your statements or the approach you use to share your knowledge. In this case, Dexter relies on his trainer Ken because he shows him a method to complete his task faster. Dexter respects and follows Ken's instructions because of the accuracy of his philosophy.
<span>"and his smile showed red lips and pointed teeth." is a good hint.
If you think about it, this line is the only one that would be used to describe an animal.
You can ask yourself, what do you think of when you read that line.
When I read it I could almost imagine a predator like a wolf snarling, showing it's vicious teeth. In effect, when he opened his mouth to smile it's like you're getting a glimpse into him and his nature.
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Stylistic device where the writer repeats the same word or phrase for the proper use of emphasis is called repetition. Authors use it both in poetry and in prose to make the idea clearer. There are many ways how authors employ repetition as it embraces many types such as anaphora, antithesis, epiphora and so on. All this tools are meant to emphasize the meaning of the words but they express this emphasis in different ways.
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The answer of the English question is b