Final answer:
A nuclear family is not a necessary condition for productive development. High expectations, positive beliefs, opportunities, and caring relationships are key to supporting productive growth. Option C
Step-by-step explanation:
The key characteristic that is not supportive of productive development in the context of the provided statements is C) A nuclear family. While a nuclear family can indeed provide a supportive environment, it is not a necessary condition for productive development.
Supportive and caring relationships can come from various family structures and social networks. The communication of high expectations, fostering positive beliefs, and providing opportunities are more universally recognized qualities that contribute to an individual's productive development, regardless of family structure. Option C