Final answer:
The attorney is authorized to donate up to $5,000 per year to the Humane Society on behalf of the principal, given that this is the amount specified in the principal's Power of Attorney.
Step-by-step explanation:
The question pertains to the amount an attorney can donate to a charity on behalf of their client based on a Power of Attorney (POA). In this scenario, the person represented by the POA, known as the principal (O), has stipulated in their POA that the attorney may donate up to $5,000 per year to the Humane Society. Seeing as the principal's income is $10,000 annually, the attorney is authorized to donate the stipulated amount of up to $5,000 in a given year, as long as they are acting within the confines of the authority granted by the POA and the principal's wishes.