Final answer:
The denominator of the rational expression represents the number of people going on the tour. Hence the correct answer is option B
Step-by-step explanation:
The denominator of the rational expression, 18x+35/x, represents the number of people going on the tour. In this case, x represents the number of people. The denominator is the bottom part of the fraction, which indicates how many people are going on the tour.
Hence the correct answer is option B