Rosalie and Henry work at a nursery where they grow sunflowers. Rosalie works all day in the hot sun, planting and harvesting sunflowers, where she earns $$34$ per hour. Henry, on the other hand, works inside the air conditioned warehouse, drying and roasting sunflower seeds, and earns $$22$ per hour.

Which source of wage differences is exemplified by the example?

compensating differentials

differences in human capital

different talents

differences in ability

differences in negotiation skills