Answer: Option B: Los lácteos
Explanation: The question is:
¿Qué grupo de alimentos es rico en calcio?
And a rough translation of this is:
What group of aliments is rich in calcium?
The options are:
A. los granos (The grains)
B. las lácteos (dairy products)-- (It must be written as Los lácteos instead of Las lácteos)
C. los vegetales (Vegetables)
D. las proteínas (The proteins)
From the options, the aliments most rich in calcium are dairy products, so the right option is B.