In an essay written in a formal style, the kind of tone that the writing should have is: Objective.
An objective tone is a tone where the writer states the facts of a matter. He takes no sides but simply states matters as they are. When writing a formal essay, it important to be objective.
This will require that the facts of the matter are presented and backed by evidence. So, option C is right.
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Option 1 (It describes the days being discussed) is correct since it refers to a particular set of days, those in which the subject of the sentence goes jogging, and a particular moment of the day which is the morning.
Option 3 (It creates a compound-complex sentence) is correct because the sentence contains two independent clauses and a dependent clause.
The two independent clauses are: "<em>My mind seems to process ideas faster</em>" and "<em>My mood is more positive</em>". These two independent clauses are joined by the coordinating conjunction "<em>and</em>". The compound-complex sentence also includes a dependent clause "<em>On days when I go jogging in the morning</em>" which is dependent on the two main independent clauses previously mentioned.
1.I regularly drudge five days a week, yet I usually sleep through the weekends.
2. I regularly drudge five days a week, and need sleep through the weekends.
The referee called an amazing play.
The brokerage sold the house for a good price.