Read the article and answer using the possible answers provided.

The correct answer is D. Dr. Salk has traveled and given the polio vaccine to children in foreign countries.

Explanation:

The other three options are stated on the second paragraph, however, the passage does not say anything about Dr. Salk traveling to give the polio vaccine to children in foreign countries.

i think they are preparing for the battle of gaul. : )

i hope this you! : )