Laurie's mother's main motivation for attending the P.T.A. meeting is: 2. to meet and speak with Charles's mother.
An inference is a process through which a reader deduce the meaning and message that is associated with certain text in a literary work, especially through induction.
Based on the story of Charles, we can infer and logically deduce that the main motivation for Laurie's mother's to attend the P.T.A. meeting is simply to meet and speak with Charles's mother about her son.
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