No, Because Harriet had no knowledge of the painting for her house, While there was an added benefit. There is no quasi-contract at all.
Goods sold is lower because less competition and then they price it higher because consumers don't have options.
From the given options, the activity which exemplifies gathering data by observation is option D: Measuring how many parts workers assemble in an hour. This is the best answer as it uses senses to observe people in naturally occurring situation — according to the definition of observation as a data collection method.
