Verified Answer :

Um... neither is right, it should be 

el niño es serio

because it is just one, not plural

florescarol121

Answer:

both are wrong the perfect answer is "El niño es serio" or you can either say "chico" but niño is for a child Chico is for a guy but if I put it in your  question it would be "El niño es serio"

Explanation: btw you can say "el nino esta serio"

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