Answer:
Navegan Sophie y Charlie en el río Paraná en kayak
Explanation:
The options are:
Navegan Sophie y Charlie en el río Paraná en kayak
and
Sophie y Charlie navegan el río Paraná en kayak
Where the difference is that in the first one, the verb is at the beggining and in the second one the verb is after the subjects.
The correct way to ask things, is first use the verb, so the correct option is the first one.
