The GRE question is the product of a slovenly mind that doesn't recognize that it is wallowing in its own slop.
"wider appeal" is a lazy phrase that could mean two very different things:
-a) appealing to (liked by) many people
-b) appealing to (liked by) people in different demographic segments of society and in different geographic settings (different age groups, different economic groups, different ethnicities, different living conditions, such as urban and rural and suburban) and so on.
A work of art with large numbers of people liking it who are males aged 25-40 who didn't complete secondary school and no one else, is very different from a work of art that is liked by people of all ages, educational levels, economic statuses, and living conditions.
I don't know of any elitist who would say that broad appeal under meaning b) is a sign that the work of art is trash, just the opposite, and I know of many elitists who would say that broad appeal under meaning a) is a pretty good indication that the work of art is something with little redeeming value, such as a movie with half-hour car chases and lots of things exploding.