Schaie believed that when young adults apply their intelligence to attain long-term goals and confront and resolve major issues, such as what job to take, whom to marry, etc., they are using an operation in the

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Schaie's theory describes the achieving stage as occurring between the ages of 22-35, during which individuals apply their intelligence to accomplish long-term goals and navigate major life choices. Therefore, the best choice is D, the achieving stage.

Schaie Believed That When Young Adults Apply Their Intelligence to Attain