Answer: B. statements that appeal to a wide audience
Explanation
As defined by Richard Nordquist, writing for ThoughtCo, "A glittering generality is a vague word or phrase used to evoke positive feelings rather than to convey information."
If a political candidate promises, "I will promote growth that will bring us into the 21st century," or says that she is the one who will bring "peace, prosperity, and progress," those are all vague, hopeful-sounding terms -- but there is no explanation of how exactly the candidate will work to achieve those goals.
Offering glittering generalities is not wrong, but if there are no concrete action plans or details provided, then the phrases are only propaganda.