Number 1 is <span>Nos trae un pastel los domingos.</span>
Option A. Ellos lo compraron. Reloj is the subject, and it is singular masculine.
This question is asking for the english spanish version of the english "it." In spanish, the word "it" has four versions depending on gender and quantity. Lo is masculine singular, La is feminine singular, Los is masculine plural, and Las is feminine plural.
19. Somos
20. Estamos
22. Irán
23. Juegas
The correct answer is “lo”, because pantalones is a masculine noun.