Which of the following refers to “their” as used in the passage?

Directions: Read the following passage carefully and answer the question.

Winter is the time of the year when the intensity of the heat and light emitted by the sun is reduced. Dogs abandon the shadowy retreats of houses, trees and ditches for the open spaces of yards, lawns, terraces and verandas where they stretch out savouring the affection of the balmy sun. Their elderly human companions catch its benign rays to thaw out their joint pains while having settled comfortably in recliners, easy chairs and other comfartable perches. Morning walk routes also burst into colours as the morning walkers come out draped in a variety of colourful winter dressings.