B). 'Many pilgrims who came to see his Walden house site were outraged by the commercialism.'
Explanation:
Pathos is described as the 'emotional appeal' in which the author attempts to convince the audience to accept and believe their claim by evoking their emotions.
As per the question, the excerpt 'many pilgrims...commercialism' represents the use of pathos or appeal to emotion as it attempts to convince the readers about the 'negative impacts of commercialism' by evoking their emotions by using the descriptive words like 'outraged' and encourage them to 'live a simple life in solitude and unity of nature.' Thus, <u>option B</u> is the correct answer.
