A. Sara borrowed P50,000.00 from Julia and orally promised to pay it within six months. When Sara tried to pay her debt on the 8th month, Julia demanded the payment of interest of 12% per annum because of Sara's delay in payment. Sara paid her debt and the interest claimed by Julia. After rethinking, Sara demanded back from Julia the amount she had paid as interest. Julia claims she has no obligation to return the interest paid by Sara because it was a natural obligation which Sara voluntarily performed and can no longer recover. Do you agree? Explain. (4%) B. Distinguish civil and natural obligations. (2%)