Final answer:
Limited fuel options do not enhance the popularity of automobile travel, contrasting with convenience, flexibility, and personal space that all make driving a popular choice for transportation. Increased fuel efficiency of cars makes them more appealing, despite the drawbacks of limited fuel options.
Step-by-step explanation:
The attribute that does not contribute to the popularity of automobile travel is c) limited fuel options. This is because the popularity of cars is often attributed to their convenience and flexibility, allowing for travel on one's own schedule and route. Cars also provide the comfort of personal space and privacy. In contrast, limited fuel options can be seen as a drawback since it constrain the ability of car owners to find suitable fuel for their vehicles, potentially making it less convenient if certain fuels are not widely available or are more expensive.
It's worth noting that while many people are interested in hybrid cars due to environmental concerns, this aspect is not discussed in the provided context and does not negate the disadvantages of limited fuel options. Furthermore, the increasing fuel efficiency of cars that get more miles per gallon enhances their appeal and can compensate for some of the drawbacks of having fewer fuel options.