Final answer:
The correct order in terms of decreasing size is sand, silt, clay.
Step-by-step explanation:
The correct order in terms of decreasing size is a) Sand, silt, clay.
According to the information provided, sand is deposited close to shore, silt is further away, and clay is the furthest. This is because sand has larger particles, silt has smaller particles than sand, and clay has the smallest particles.