Answer:
Eliana Rodriguez, who teaches biology, is my favorite teacher because she gives engaging lectures.
Explanation:
Because is a conjunction and a comma is not used before and after a conjunction as its purpose is to join two sentences. A comma is used to separates two ideas or things from each other.
The 3rd and 4th options are therefore incorrect as they both have a comma before or after the conjunction.
The first option is also incorrect. It separates the subject but not the two ideas of the sentence.
The second sentence is the correct option it separates the subject, adverbial phrase and the predicate in the given sentence.
Eliana Rodriguez, ( subject)
who teaches biology, ( adverbial phrase teaches biology)
is my favorite teacher because she gives engaging lectures. (prdeicate)
