Question

which is a thesis statement?
in order to confirm the effectiveness of the polio vaccine that he had invented, jonas salk administered it to a number of people, including his wife, their children, and even himself.
although jonas salk invented the polio vaccine, it is albert sabin, creator of a safer and cheaper version of the vaccine, who deserves the credit for curing polio in the u.s.

Explanation:

A thesis statement presents a clear, arguable claim that guides an essay. The first option only states a factual event about Jonas Salk testing his vaccine, with no debatable position. The second option makes a specific, arguable claim that Albert Sabin (not Salk) deserves credit for curing polio in the U.S., which is a thesis that can be supported with evidence.

Answer:

Although Jonas Salk invented the polio vaccine, it is Albert Sabin, creator of a safer and cheaper version of the vaccine, who deserves the credit for curing polio in the U.S.