Read the excerpt from Immigrant Kids, by Russell Freedman. 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.

How does the author's use of concrete details such as "stood directly in the path," "swift movement," and "grabbed" affect the reader’s impression of the doctor?

A. These details describe how the doctor felt about doing trachoma inspections.
B. These details provide information about medical examinations from the doctor’s perspective.
C. These details describe the doctor’s actions as direct and focused.
D. These details provide a list of medical examinations.