Katherine gives piano lessons for $15 per hour. She also grows flowers, which she arranges

and sells at the local farmer’s market. One day she spends 5 hours planting $50 worth of seeds in her garden. Once the seeds have grown into flowers, she can sell them for $150 at the farmer’s market. Katherine’s accounting profits are：

A、$100, and her economic profits are $75.

B、$100, and her economic profits are $25.

C、$25, and her economic profits are $100.

D、$75, and her economic profits are $125.