Question

Which of these options is a complex sentence?

Answer 1

A) is a complex sentence
Complex Sentence consists of 1 independent clause and 1 dependent clause.

As she was unable to swim- dependent clause (it can't be a sentence on its own)

Lena didn't want to go to the pool party- independent clause (it can be a sentence on its own)

If a dependent clause comes before the independent clause, there has to be a comma joining the 2 clauses.