An experiment is carried out to determine how well different biological washing powders break down protein. Four cubes of cooked egg white (protein), each the same size, are prepared and their masses are recorded. The protein cubes are then placed in test-tubes containing $10\text{ cm}^3$ of solutions made from four different biological washing powders, all at the same concentration. The cubes are kept in the solutions at room temperature. After 24 hours, the protein cubes are taken out of the test-tubes and their masses are measured again. What is the percentage decrease in mass of the cube of protein in the most effective washing powder given to one decimal place?
- A17.5%
- B19.2%
- C22.5%
- D29.1%