Final answer:
T. Boone Pickens was the Oklahoman most noted for his philanthropy, as he made significant donations to various causes, particularly in the areas of education and medical research. The correct option is 4.
Step-by-step explanation:
The Oklahoman who was most noted for his philanthropy was T. Boone Pickens. Pickens was a businessman and philanthropist who made significant donations to various causes, particularly in the areas of education and medical research. He established the T. Boone Pickens Foundation, which focused on improving lives through grants supporting education, medical research, and services to children and veterans.