Is it worth including "porque sé hablar tres idiomas" as another permissible option? ... (Or if that is wrong, perhaps you could point us towards an explanation as to why it is necessary to use "puedo" here).
Freeform Writing Exercise A2
Saber here is absolutely right. That will be added to the possible answers shortly.
I can only imagine that as this is a A2 exercise, the creator of the exercise has given a more literal translation using poder. We have our lesson about "saber" one level up, but I agree it should be shown as another very correct answer.
Gracias y saludos.
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