Question

Most small animal private veterinary practices employ __________ veterinary assistant(s) for each veterinary technician on staff. A. three B. four C. one D. two

Answer 1

Most small animal private veterinary practices employ C) one veterinary assistant for each veterinary technician on staff. 
Since they are very small, they don't need more people. 

Answer 2

I believe the answer is: C. one

.

The number of assistants that is used for veterenary practice would commonly depended on the complexity of the surgery. (as the surgery get more complex, the number of assistant needed would increase.)

Since small animals considered to have less complex body structure compared to big animals, the number assistant used usually just one.