Necesita mucha fuerza porque debe nadar rápidamente
Explanation:
The options given translate to swim, kick, hit and run. Out of these only swim applies. However, in some Spanish speaking countries "patear" when used in a swimming context can refer to the act of "kicking" the water to propel yourself forward when swimming, so it could be correct in some specific situations.
The answer is radar if this was in english it would be Eduardo: I like swimming. Víctor: He needs a lot of strength because he must _swim_________ quickly. swim kick hit run. And in spanish it would be <span>Eduardo: A mí me gusta la natación. Víctor: Necesita mucha fuerza porque debe _nadar_________ rápidamente. nadar patear golpear correr.