Answer:
D. At this car dealership, they consistently prioritize high-quality customer service, so buying a car is actually a pleasant experience
Step-by-step explanation:
An implied reference is when the noun that a pronoun describes is not directly stated in a sentence, but is implied, or not explicitly stated. This sentence is an example of that because who "they" are is implied. In the sentence, it doesn't directly talk about the people who work at the car dealership, but you can imply that "they" refers to the dealership's workers from context clues like the narrator saying that this is taking place in a dealership.