(c) Perseverant
A perseverant mindset helps an entrepreneur accept failure, not give up, and continuously experiment to achieve success.
"Perseverance" specifically refers to the quality of continuing despite difficulties or failure — it covers accepting failure, not giving up, and experimenting repeatedly. "Optimism" is a positive outlook, "self-confidence" is belief in oneself, and "energetic" refers to physical drive — none of these fully capture the idea of persistent effort through failure. Examiners expect you to pick the one term that matches the full description in the question.