This depends on several factors. If your university major is different than your career choice, then you could answer that you would choose a different major to prepare you for your choice in career. Or if you started at a small company and didn't have many opportunities, you can say that you would have started at a larger company. This is not a significant question so a regular answer should suffice.
This is an acceptable answer because the answer doesn't display any problems in the work history. Many people change careers or go into a field that is unrelated to their major. This is common, so answering this question using this answer is common. If you don't want to use this common answer, then thinking about a scenario early in your work career that you would have done differently might be more effective.
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