Final answer:
Option c) 'The labor practices of the fast food industry have their origins in the assembly line systems adopted by American manufacturers in the early twentieth century.' best illustrates the use of the rhetorical appeal logos in 'Fast Food Nation'.
Step-by-step explanation:
The excerpt from 'Fast Food Nation' that best illustrates the use of the rhetorical appeal logos is option c) 'The labor practices of the fast food industry have their origins in the assembly line systems adopted by American manufacturers in the early twentieth century.'
This excerpt appeals to logos because it presents a logical argument based on historical facts. It explains the connection between the labor practices in the fast food industry and the assembly line systems used by American manufacturers in the past.