Marcus purchased 80 shares of stock in a computer company at $74.19 per share and Taylor purchased 65 shares of stock in a different computer company for $85.21 per share. After holding the stock for two years, Marcus sold his for a total of $6,404.57, and Taylor sold hers for a total of $6,192.83. Which person had a higher ROI and by how much?

a Taylor: 3.9% more
b Taylor: 11.8% more
c Marcus: 7.9% more
d Marcus: 3.9% more