Which career would you choose from these 3 choices?

Do some work experience. Then choose wisely. Because once you apply and are accepted, you'll not have the opportunity to change your mind. Do some shadowing for a few days with someone and ask them what the pros and cons are of the job. You may think it sounds fun to help poor sick puppies, but how would you feel if you were called out at 3am in a thunderstorm to help a cow calve? And being a pharmacist might mean that you're just stuck in a lab all day culturing cells.