Well, if you want the answer for "I would tell them to know what they want to do before going to college", then it's " Les diría que sepan lo que quieren hacer antes de ir a la universidad "
Ur answer would be (B) "Les"
Yo "les" doy mucha tarea a Uds
Hope it helps:)
The answer is “empezamos a comer.”
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Natalia quiere a mis hermanas