The correct answer is 'nació'.
This is because 'nacimos' is the 'nosotros' indicative preterite form of the verb 'nacer' (to be born), which means "we were born".
'Naciste' is the 'tú' preterite form of 'nacer', which means "you were born", but it's informal. Sandra is talking to her grandfather (abuelo), and refers to him with 'usted', so it can't be 'naciste' either.
'Nací' is the 'yo' preterite form of 'nacer', which means "I was born", but she is referring to her grandfather being born in 1926, so it can't be 'nací' either.
Me gustaría visitar Venezuela es un país hermoso llego de maravillas naturales,y gente increible. En Venezuela generalmente es calurosas todas las épocas del año,pero hay un lugar llamado Mérida en Venezuela que siempre hace frío es increible. Necesito llevar ropa abrigada como chaleco,guantes,gorros y botas así no tendré tanto frio.
A. Me enoja que ellos maten todo.
This is just a mistranslation.
Remember that in this type of sentence the important thing is to identify the subject, the verb and the object.
Is wrong, I think is "cre<span>í</span>do que"