Final answer:
President Eisenhower's words suggest that he views Dr. Salk's development of the polio vaccine as an historic contribution with worldwide impact, classifying Dr. Salk as a benefactor of mankind.
Step-by-step explanation:
When President Eisenhower refers to Jonas Salk's work as an "historic contribution to human welfare" and an "extraordinary achievement," he is expressing a profound respect and admiration for the global impact of Dr. Salk's work. His description of Dr. Salk as a "benefactor of mankind" clearly indicates that the president believes Dr. Salk's efforts have greatly benefited people across the world, not just in a specific region or community. Thus, the president's words strongly suggest that he believes Dr. Salk has made an impact on the entire world (Option B).
The words and phrases used by President Eisenhower to describe Jonas Salk's work express his belief that Dr. Salk has made a significant impact on the entire world. The president refers to Dr. Salk's contribution as "historic," emphasizing its importance in the context of human welfare. He also calls Dr. Salk's achievement "extraordinary" and refers to him as a "benefactor of mankind," further highlighting the global significance of his work.