(C) Being indisciplined.
Being indisciplined is not a step to build self-motivation. The four steps are: finding out your strengths, focusing on your goals, planning to achieve your goals, and staying loyal to your goals.
Source: Chapter 2, Session 3: Self-motivation — Building Self-motivation
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The textbook lists four clear steps for building self-motivation (Figure 2.9): find out your strengths, set and focus on goals, develop a plan, and stay loyal to goals. Options A, B, and D directly match three of these steps. "Being indisciplined" is the opposite of what self-motivation requires — examiners expect you to identify it as the odd one out.