Answer:
D). Fact that these individuals were less likely to smoke and drink to excess.
Explanation:
The connectivity that Terman discovered 'between the conscientious characteristic or social dependability trait possessed during childhood leading to reduced chances of dying in adulthood' could be explained by the 'fact that these children are least likely to smoke or drink excessively due to being restricted by their conscience and social dependability which would prevent them from getting involved into such activities and therefore, they would possess lesser chances of dying in adulthood. Therefore, option D is the correct answer.