Final answer:
The sentence “¿De dónde eres usted?” is incorrect because the word “usted” is unnecessary and makes the sentence grammatically incorrect.
Step-by-step explanation:
The sentence “¿De dónde eres usted?” is incorrect as written.
The correct sentence would be “¿De dónde eres?”.
The word “usted” is a formal way of addressing someone in Spanish. However, in this context, it is not necessary and would make the sentence grammatically incorrect.
Learn more about Spanish grammar