The skylights, that were made with aluminum leafing, indicate the time period in which the great hall was constructed.

how is the comma used incorrectly in the sentence?

a. the comma attempts to set apart an essential element.
b. the comma attempts to separate a compound subject.
c. the comma attempts to separate a compound predicate.
d. the comma attempts to join two independent clauses.

A

Explanation:

The relative clause "that were made with aluminum leafing" is an essential element because the sentence is not referring to all skylights in the Great Hall, but specifically to those made with aluminum leafing. By setting apart this essential (defining) clause, the meaning of the sentence is altered.

its is b

explanation:

the reason it is b is because b is in third person saying destiny chose this so therefore it is b