Answer: The R part which stands for RARENESS/RARITY.
Explanation: The VRIO analysis is an acronym for Value, Rareness, Imitability, Organization.
This analysis is used in the evaluation of a business resources and factors that places it above their competition.
The rareness/rarity begs to question if the resource used in business are in the hands of a few.
In this question, Rohan was looking to expand his business by adding a pick-up service but by asking the rareness question, he discovered that the competitive advantage is in the hands of another business Tow-It-Now Inc.