
Maria M. answered 06/25/22
Cuban native speaker
Congratulation, you have them all correct! The question is asking you to match the pronouns based on whether they are masculine or feminine, singular or plural. Las and Los lets you know that the noun is plural so you would match them with a plural relative pronoun. El or Ella signal to the noun being singular. El and Los always means that the nouns are masculine. In a similar way, Las and una mean that the noun is feminine.
la cual= fem, sing
el cual= masc, sing
las cuales= fem, plural
los cuales=masc, plural
con quienes= masc, plural
I hope that helps!