Final answer:
The national exam for vet techs in the United States comprises 150 questions, with a completion time of 4 hours, corresponding to option (c).
Step-by-step explanation:
In the United States, the national exam for vet techs consists of 150 questions with 4 hours for completion. The correct answer is therefore option (c) 150; 4. This exam is known as the Veterinary Technician National Examination (VTNE), and it is designed to evaluate the competency of entry-level veterinary technicians and ensure they have the necessary knowledge and skills to practice safely and effectively. Veterinary technologists and technicians are responsible for the careful and humane handling of laboratory animals. Veterinary technologists and technicians, supervised by licensed veterinarians, do medical tests that help diagnose animals' injuries and illnesses. It is important for vet techs to possess a wide range of knowledge and skills in order to provide quality care to animals.