1 I want to visit nepal because the landscape will be amazing to you.
This sentence doesn't work. The pronoun you at the end does not work with the subject, I. The speaker says he wants to visit Nepal. He gives the reason that the landscape is amazing to "you". Well, if the landscape is amazing to someone else what does that have to do with him visiting Nepal? It should say that the landscape will be amazing to "me" so that it refers back to I as the subject. The other options are all correct. It is the correct antecedent for area. Her is the correct antecedent for Anne. She is the correct antecedent for Todd's sister.