Answer:
Serious and forceful
Step-by-step explanation:
This is the tone that Robert Lake adopts in the text "An Indian Father's Plea." In this text, Lake wants people, and in particular educators, to understand what it is like to be an Indian child. He wants to bring awareness to the fact that childhood can be different depending on your background. In order to convey the importance of this topic, Lake uses a serious and forceful tone.