Which of the following is a complete sentence from the passage?

"She knew with certainty that she could count on new, better experiences throughout the next chapter." is the correct answer. Because it is a complex sentence with independent and dependent clauses.
"The night before Kendra left for college." This is incorrect because it is a dependent clause and requires an independent clause in order to function as a sentence.
"Which extracurricular organizations she might join." This is incorrect because it is one item in a listed series of indirect questions.
"Could count on new, better experiences throughout the next chapter." This is incorrect because it is missing a subject.