Final answer:
In Spanish, the definite article and noun must agree. 'Las computadoras' is correct, while 'la libro' is incorrect.
Step-by-step explanation:
The definite article and noun must agree in Spanish. When a noun is feminine and singular, the definite article 'la' is used. For example, 'la computadora' means 'the computer.' On the other hand, when a noun is feminine and plural, the definite article 'las' is used. For example, 'las computadoras' means 'the computers.'
However, in the phrase 'la libro,' there is an agreement error. 'Libro' is a masculine noun, so it should be paired with the masculine definite article 'el.' The correct phrase should be 'el libro.'
Learn more about Agreement of definite articles and nouns in Spanish