Answer
(O) - It is an observation made by Lucia.
Work Step by Step
Lucia wants to develop a process for dyeing shirts so that the colour will not fade when the shirt is washed. After conducting experiments in 1.10c and 1.10d, Lucia observes that the dye has faded on the shirts in water, salt water, and baking soda, while the dye did not fade on the shirt soaked in vinegar.
