read this passage from "an indian father's plea" by medicine grizzlybear lake:

my indian child has a constitutional right to learn, retain, and maintain his heritage and culture. by the same token, i strongly believe that non-indian children also have a constitutional right to learn about our native american heritage and culture, because indians play a significant part in the history of western society. until this reality is equally understood and applied in education as a whole, there will be a lot more schoolchildren in grades k-2 identified as "slow learners."

my son, wind-wolf, is not an empty glass coming into your class to be filled. he is a full basket coming into a different environment and society with something special to share. let him share his knowledge, heritage, and culture with you and his peers.
which word best describes the tone of the passage?
a) impolite
b) respectful
c) regretful
d) casual