The answer is letter D.
In order
to prevent diseases and ensure the health of your pets, you should have them
checked by the veterinarian every three to four months. This is because
vaccinations and the necessary shots that they need for their immune system and
internal organs could be kept up-to-date by the veterinary clinic. This way,
pets are cleared or prevented from contracting any unnecessary microorganisms,
bacteria, or virus in their bodies. This is a preventive measure that all
clinics should remind different pet owners to prevent any untoward incidents.