Which of the following represents an ascending order as per the size of particles?

Particle size in ascending order (smallest to largest) is Clay < Silt < Sand < Gravel < Rock. Clay particles are the smallest (less than 0.002 mm), followed by silt (0.002-0.05 mm), sand (0.05-2 mm), gravel (2-75 mm) and rocks being the largest. This is the standard soil texture classification used in earth sciences and agriculture.