Answer:
The right answer is, D. He knew who the principal of the school was.
Explanation:
Because in the sentence raised they tell us that he knew who the school principal was, and the option that describes this situation is D.
Cuerpos de Seguridad del Es- tado, prisión, Establecimientos Penitenciarios Militares, derecho pe- nitenciario
Is this even Spanish? It looks like a medical question to me