I believe the answer is " Tu piensas "
Buenas tardes, Soy Felipe, como estas?
bien, gracias. Me llamo Elena. mucho gusto, Felipe
igualmente, de donde eres tu, Elena?
soy de Espana, y tu?
Soy de Nicaragua
According to the option provided the answer would be "¡ Ella está guapa en su traje de novia!" This would mean that she is pretty in her wedding dress.
if we pay attention to the verb form, it might be said that it agrees in gender and number with the subject pronoun "ella". It is 3rd person singular and feminine. <span />