A car manufacturer notices that customers are increasingly buying its most fuel-efficient models. At the same time, its top two luxury models also make up significant sales. What might the marketing department recommend for the next year's line-up?

A. a larger luxury car
B. a fuel-efficient luxury car
C. a strict focus on fuel-efficient cars
D. a truck that will attract different customers

Based on the given information, the marketing department might recommend a fuel-efficient luxury car for the next year's line-up. This recommendation is based on the increasing customer preference for fuel-efficient models and the significant sales of the top two luxury models.