The correct answer is: The context clarifies unfamiliar words in the text for the reader.
In this excerpt, the mention of "kwashiorkor" is made in the context of pictures and diagrams related to children who are suffering from various illnesses. This context helps the reader understand that kwashiorkor is a condition related to malnutrition, which is relevant to the discussions of the health issues depicted in the book. Without this context, the term may remain unfamiliar to the reader, but the surrounding information aids in grasping its meaning.