Select the Answer That Joins Each Pair of Simple Sentences

Multiple Choice

Select the answer that joins each pair of simple sentences with conjunctions or conjunctive adverbs correctly and is punctuated correctly. Audrey was late for work.
She had to drive her sister to school.

A) Because Audrey was late for work, she had to drive her sister to school.
B) Audrey had to drive her sister to school, so she was late for work.
C) Audrey was late for work although she had to drive her sister to school.