Right Answer:
<h2>
el
</h2>
This is an interrogative sentence, where the subject (noun) is masculine singular.
In Spanish grammar <u>the article</u> is a word that clearly indicates the gender and the number of the noun. <u>Its function is to modify the noun it introduces.</u>
The articles are as follows:
<h2>
Variable Articles:
</h2>
Defined Articles:
Singular Masculine: el
Singular Femenine: la
Plural Masculine: los
Plural Femenine: las
Indefinite Articles:
Singular Masculine: un/uno
Singular Femenine: una
Plural Masculine: unos
Plural Femenine: unas
<h2>
Invariable Articles:
</h2>
Neutral: Lo
Contractions: al (a+el) and del (de+el)
Now, going back to the sentence, and remembering the <u>noun</u> <em>muchacho</em> (boy) is masculine singular. The article that fits here is the Defined Article in Singular masculine <em><u>el</u></em>
Therefore, the complete questions is:
<h2>¿Quién es <u>el</u> muchacho rubio?
</h2>
Who is <u>the</u> blond boy?
