Self-confidence is the quality of an entrepreneur indicated by "One must believe in oneself." An entrepreneur trusts their own abilities and decisions to start and run a business successfully.
The question asks for one entrepreneurial quality linked to self-belief. The expected answer is simply self-confidence. In board exams, naming the quality with a brief one-line explanation is sufficient for 1 mark. Note: the source passages provided are about investment basics and do not directly cover entrepreneurial qualities, so this answer draws on standard CBSE Business Studies/Entrepreneurship knowledge.