What purpose does the semicolon serve in the following sentence?

Leticia has to leave early this afternoon; she has a doctor's appointment.

1. The semicolon separates the words in a series.

2. The semicolon joins two related independent clauses.

3. The semicolon introduces a quotation.

4. The semicolon summarizes the information that come before it.

Respuesta :

I think the answer would be B, since both sentences in this one are both independent clauses, and the semicolon separates them.
Nadra
The purpose of the semicolon in the example is to join two related independent clauses (option B)

In this case, the semicolon is used instead of a conjunction. They are generally related however, the second part might not be an explanation or clarification. 
the semicolon could have been replaced by BECAUSE perfectly well. 

Leticia has to leave early this afternoon because she has a doctor's appointment.
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