The correct answer is A. But she also called her best friend
Step-by-step explanation:
Parallelism implies elements in a sentence follow the same grammatical structure or pattern. This applies to correlative conjunctions such as either/ or, both/and or not only/but also because these pairs of conjunctions usually go together and by using them together there is a specific grammatical pattern or parallelism.
This implies, in the sentence presented, the correct option is "but she also called her best friend" because the conjunction "not only" should be used along with the conjunction "but also" to create parallelism. Additionally, this option uses the same tense (simple past) as in the first section of the sentence.