6258. He would have been successful, but for his lack of temerity.

✅ The correct answer is option A.
Audacity : a willingness to take bold risks.

Sincerity : the absence of pretence, deceit, or hypocrisy.

Confidence : the feeling or belief that one can have faith in or rely on someone or something.

Strength : the quality or state of being physically strong.

Temerity : excessive confidence or boldness; audacity.

Synonym of Temerity is Audacity