The correct options are
A Wind
B Water
C Living things
D Sunlight
Weathering is the process of breaking down of rocks into smaller pieces.
Wind, water, plant roots and heat are all factors that influence weathering.
Water, sunlight and wind breaks rocks to form sand.
Plant roots can wedge their way in between the small cracks in rocks and over longer periods of time when the plant grows, the pieces of rock break off.