Aqui avez-vous parlé au café hier ? j'ai parlé à mes amis. vous avez parlé aux garçons. tu as parlé aux touristes. ils ont parlé aux filles.

J'ai parlé à mes amis. 

This is the answer because "A qui" means With who

The avez-vous indicates J'ai should be in the response. 

The question is being asked to a well respected person (aves-vous) and is asking : Who did you speak to at the café yesterday? 

 The other answer choices would not be a grammatically correct response from the person being asked this question. Does that make sense? Hope this helped! Bonne chance pour tes examens! 

The correct answer would be the first option: J'ai parlé à mes amis.

EXPLANATION: Notice the use of the pronouns in the question "vous".Because the question is addressed to "vous" which is "you," then the reasonable answer would use "j'ai" which is in the first person.

I’m confused on the question