Question

1. mis hermanos son

○ alemán
○ alemanas
○ alemanes

Explanation:

The subject "Mis hermanos" (My brothers) is masculine plural. The adjective "alemán" (German) has to agree in gender and number. The masculine plural form of "alemán" is "alemanes". "alemán" is singular, "alemanas" is feminine plural, so the correct option is the first one.

Answer:

A. alemanes