For this case we can translate the sentence given as:
In the waiting room there are many_____________
The options given are:
A. Hospital
B. Patients
C. Bandages
D. Technologists
We know that when people go to a hospital and they still don't have to be taken care of or are with companions, they have to wait in the waiting room. Generally, these people are known as "patients."
Then the sentence is completed as:
In the waiting room there are many patients.
En la sala de espera hay muchos pacientes.
Answer:
Option B