निम्नलिखित में से किस सिद्धांत का प्रतिपादन एरिक एरिक्सन द्वारा किया गया था?

Whose Bioecological Model of Development conceptualizes the environment as a series of nested structures (microsystem, mesosystem, exosystem, macrosystem, chronosystem)?

Who developed the Competence Motivation Theory, which explains how individuals are driven to achieve mastery in their environment?