Chica is feminine... reservada is feminine... so which of your options are feminine? Ella and la. Ella means she so it can't work, as that would mean she girl is very reserved. La is the femenine the. So that is your answer.
No. no quiero ir voy a la playa, yo voy a la piscine. hope that helps you any! :)
2 is los Especies en peligro de extincto 3 is the second one
