A) because it's man (Hans) and woman (Helga), so you can't choose female (alemanas) and two are plural
yesssssssssssssassssssssss
9. Mientras Enrique _C. tocaba
_ la guitarra, Carmen cantaba.
11. San Sebastian sits on B. the Bay of Biscay.
12. Juan Tomas Avila Laurel went on a hunger strike to protest A. the presidents regime in Equatorial Guinea
19. Yo _D. compré_ in libro y despues fui a casa.
It is not C. compró because I just took a test that has that same exact question and I put down C. compró and I got it wrong. So I thinks it's D. compré.
Answer: Mexico, the 5 de mayo is celebrated in honor of the Batalla de puebla (and puebla is a state in Mexico).