Final answer:
The best motto for healthy self-confidence is 'of course I can', which implies a positive and realistic belief in oneself. This choice avoids the negativity of 'I can't', the potential arrogance of 'I'm the best', and the uncertainty of 'I'll try'. option b.
Step-by-step explanation:
The motto that would make the best representation of healthy self-confidence is B. of course I can. This option suggests a positive attitude and a belief in one's own abilities without implying arrogance or defeatism. Option A, 'I can't', is a statement of defeat; option C, 'I'm the best', while positive, could suggest overconfidence; and option D, 'I'll try', while also positive, implies a level of uncertainty about one's ability to succeed. Healthy self-confidence is about having a balance between acknowledging one's self-worth and capabilities while also being open to growth and improvement.