Question

to ride a skateboard; comer; fútbol americano; montar a caballo; montar en monopatín

Explanation:

The phrase "to ride a skateboard" refers to the action of riding a vehicle/animal. Let's translate and match each option:

1. comer = to eat (unrelated)
2. fútbol americano = American football (unrelated)
3. montar a caballo = to ride a horse (matches the "ride" action category)
4. montar en monopatín = to ride a skateboard (direct translation match)

Answer:

montar en monopatín