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What is the phrase decir que used to express in spanish?

*fluent spanish speakers! * super easy request, can you me translate the following into spanish? don't use google translate, as it isn't accurate. it has been one week since i went to orlando. i visited my family and spent the week at disney world.

Choose the sentence in which the capitalized word is grammatically correct.  a.  africa no están tan grande como eurasia.      b.  el río más grande del mundo son en sudamérica.      c.  el príncipe estoy de sudamérica.      d.  era amigo de la princesa de india