Detailed Instructions: In this task, you're given a context, a sentence,  and a character. The sentence describes an action or job of the given character. Also, the context provides more information about the sentence or the character. Your task is to write the character's motivation by doing a specific job, which is given in the sentence. You can use context to find the motivation; however, all the inputs do not provide context. Also, in some inputs, there can be zero motivation; output, 'None' in this case.
Problem:Context: Valerie came onto the stage. She tried to sing a song for the entire audience. They began to yell in a violent tone. 
 Sentence: Valerie noticed their anger but continued to sing. 
 Character: Audience
Solution:
to boo