A student performs a thin-layer chromatography (TLC) analysis to identify a component in an analgesic drug sample. The developed TLC plate is shown below, with the height measurements of the baseline, the drug component spot, and the solvent front recorded relative to the bottom edge (0.0 cm) of the plate:
What is the retention factor (RfR_fRf) value of this drug component?
0.750.750.75
0.700.700.70
0.590.590.59
1.431.431.43