Final answer:
Learning to relate to adults outside the family on a regular basis is a key developmental task in achieving autonomy.
Step-by-step explanation:
The key developmental task as children move toward autonomy is learning to relate to adults outside the family on a regular basis. This involves developing the social and communication skills to interact with individuals from different backgrounds and authority figures outside of the immediate family. It allows children to gain independence, learn from other adults' experiences, and broaden their perspectives.
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