Respuesta :
The History of Mexico (La Historia de Mexico) was Diego Rivera's most famous fresco (mural) in the National Palace, I believe. I think that work is what this is referring to.
The missing word is "Maestra". Thus the complete sentence is "La obra en el palacio nacional es una obra maestra que sirve como homenaje a la vida mexicana." This word is translated "masterpiece".
How do you detect the missing word?
When a missing word fills the blank space without violating the rules of grammar and the context of the story, then it is the right word.
Thus it is correct to state that the missing word is "Maestra". Thus the complete sentence is
"La obra en el palacio nacional es una obra maestra que sirve como homenaje a la vida mexicana."
Learn more bout missing words at:
https://brainly.com/question/3883493
#SPJ9.