Part A
Based on the inferences provided, the best inference about the author's experience at the Lincoln School in "Barrio Boy" is:
The Lincoln School educators are respectful of his heritage while helping him learn how to fit in to his new life in the United States.
Part B
The excerpt that best supports the answer in Part A is:
"At Lincoln, making us into Americans did not mean scrubbing away what made us originally foreign. The teachers called us as our parents did, or as close as they could pronounce our names in Spanish or Japanese. No one was ever scolded or punished for speaking in his native tongue on the playground."
This excerpt illustrates that the educators at Lincoln School respected the students' cultural heritage while facilitating their adaptation to American life, aligning with the inference chosen in Part A.