Tina and Troy were born into impoverished circumstances, and both their parents had below-average IQ scores. Since being adopted, they are exposed to educational toys and activities, and have adoptive parents who encourage their successes. What concept is involved as Tina and Troy experience their new home?

stimulating and responsive environment

Explanation:

Tina and Troy's adoptive parents know that genetically the children have a higher chance of having low IQ scores.

In trying to tackle this problem they make sure that the environment that they grow in is stimulating and requires them to use their cognition.

This would lead to increased brain activity and synaptogenesis. Hence, this concept is called stimulating and responsive environment.