Construyen casas y hacen muebles. a. los carpinteros c. los gerentes b. los cajeros d. los abogados

A carpenter (un carpintero) is someone whose job is to make or repair wooden things. The word carpinteros is a masculine plural noun and translates into carpenters. Since this noun is masculine and plural we choose to use the definite article los that also matches the masculine plural form. Therefore:

Los carpinteros construyen casas y hacen muebles

to be alive with all her family