According to the text, what is a likely reason for the "link" between security of attachment and achievement motivation?

Question

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The text states that securely attached children tend to be more curious, self-reliant, and eager to solve problems. These traits are closely related to achievement motivation, which involves a desire to learn, explore, and accomplish tasks. Therefore, it is likely that the link between security of attachment and achievement motivation is due to the influence of attachment on a child's developing sense of competence and autonomy.

According to the Text, What Is a Likely Reason for the "Link