We can confirm that option A which states "having fully developed body systems" is in fact not one of the three major factors that contribute to emotional maturity.
The three factors for emotional maturity are those described in options B, C, and D. These factors each help to build emotional maturity in their own way by allowing the individual to undergo specific life experiences. Option A, however, is related to the physical aspects of an individual and would have little to no effect on emotional maturity.
Therefore, We can confirm that option A which states "having fully developed body systems" is in fact not one of the three major factors that contribute to emotional maturity.
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