Which sentence is correctly written?
A. An important element of tragedy is the origin of the sorrowful outcome that according to the classical prescription,
which must be mistaken by the protagonist.
B. An important element of tragedy is the origin of the sorrowful outcome, according to the classical prescription, must
be a mistake by the protagonist.
C. An important element of tragedy is the origin of the sorrowful outcome, which, according to the classical prescription,
must be a mistake by the protagonist.
D.
An important element of tragedy is the origin of the sorrowful outcome, that according to the classical prescription
which must be mistaken by the protagonist.

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tree and the cat in the tree

- "a nonrestrictive clause functions as a modifier to a noun (that is an object, person or concept). these clauses can be described by the following three options: it is set off by comas, it contains a subject and a verbs and it adds nonessential information to the sentence.

for example, in "here is bill gates, who confounded microsoft software company" we can identify "who confounded microsoft software company" as a nonrestrictive clause modifying the noun bill gates. this clause can be describes as a nonrestrictive clause because it is separated by a comma, it adds nonessential information to identify who bill gates is and it must contain both a subject (who) and a verb (confounded)."