A student puts two equal-sized samples of crushed apple into two beakers, P and Q. She pours $5\,\text{cm}^3$ of pectinase solution into beaker P and $5\,\text{cm}^3$ of water into beaker Q. Five minutes later, she transfers the crushed apple samples into two separate filter funnels, then records the volume of juice passing through from each sample during a 10-minute period. Which graph represents her results?