I believe a satisfactory approach to your question would be to break the issue into two parts.

First: For a person’s propensity to be attracted to starting a business and to have the requisite personality traits for that, those people are more often born with it.

Second: When it comes to successful outcomes of all those who are attracted to the entrepreneurial direction, those are more often polished by training, education or mentoring.

See Are entrepreneurs born or made?