Read this excerpt from Immigrant Kids.

The second doctor watched for contagious and infectious diseases. He looked especially for infections of the scalp and at the eyelids for symptoms of trachoma, a blinding disease. Since trachoma caused more than half of all medical detentions, this doctor was greatly feared. He stood directly in the immigrant's path. With a swift movement, he would grab the immigrant's eyelid, pull it up, and peer beneath it. If all was well, the immigrant was passed on.

The purpose of this excerpt is

to provide information about eye doctors and to explain how they traveled the immigrant’s path.
to provide information about eye disease and to explain its medical treatment.
to provide information about scalp infections and to explain how they can be prevented.
to provide information about trachoma and to explain how it was diagnosed among immigrants.

D. to provide information about trachoma and to explain how it was diagnosed among immigrants.

Explanation:

This is the excerpt from Russell Freedman's book "The Immigrant Kids" which tells the story of the life of the kids who immigrated to America in early 20th century.

This particular excerpt tells about the routine check-up they needed to pass before entering the country.

It explains the screening for trachoma, an infectious disease that affects eyelids, causing even blindness. Trachoma is caused by a bacteria and is contagious, so this screening's purpose was to prevent infected kids to spread the bacteria through the country.

The excerpt provides brief information regarding the trachoma and explains the process of diagnosing it among the immigrants.

caliban is prospero's slave in the shakespear's play "the tempest"

a caption indicating the purpose of the diagram

explanation: