(C) achievable
Breaking down big goals into smaller parts will make the goal achievable.
Source: Session 4: Self-regulation — Goal Setting, Chapter 2
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The passage directly states: "Breaking down big goals into smaller parts will make the goal achievable." This falls under the 'A' in SMART goals. Don't confuse it with 'realistic' — realistic refers to goals we can work towards, while achievable specifically involves breaking large goals into smaller, manageable steps.