Answer:
Answer is D. Training and knowledge.
Explanation:
William Edwards Deming was an American professor and author, who died at the age of 93 years.
He made use of Kaizen as a model to promote an approach in processing analysis and improvement, I.e reducing waste and improve productivity and safety.
He created a Deming cycle, which is a kind of continuous improvement model with four stages, which are plan, do, study and act.
Abraham was 100 years old and Sarah was 90 years old.
Thus, while one's personal identity refers to self-knowledge associated with unique individual attributes, people's social identity indicates who they are in terms of the groups to which they belong.
