The right answer is variant a) because it respects the order:
Subject+Verb+ Predicative name + Atribute
The answer would be a because it have the noun then the article (i may have those two backwords) and finally the adjectives go afterwords in spanish. A direct translation would be ... Roberto is a boy [that is] very reserved. The words in the brackets are implied and never actually said.
The correct statement is A: "Roberto es un chico muy reservado." This statement follows the proper order and agreement between articles, nouns, and adjectives in Spanish. It respects the structure of Subject + Verb + Article + Noun + Adjective, with the adjective agreeing in gender and number with the noun.
;