Answer:
All three are correct! 
Explanation:
Did you just want to make sure they were right?
 
        
             
        
        
        
Answer:
1. c. missing tilde
2. b. needs accent
3. a. needs capitalization
4. d. misspelled word
Explanation:
1. It's missing the tilde over the "n" in años.
2. The accent in México is missing.
3. Perú is in lowercase.
4. It's "eres" not "erres".