Toward the end of the final paragraph, conradin’s “exchange” of “a long-secreted hoard of small silver” with the butcher-boy is significant because it

reveals the great store of wealth to which conradin has access
a

develops the idea that conradin finds joy in acts that would be displeasing to mrs. de ropp
b

establishes the fact that conradin has meaningful and well-established friendships
c

underscores conradin’s main desire to live on the margins of society, ignoring its rules and customs
d

introduces an element of criminality into the passage that seems wholly out of character for conradin