Correct option is B
• Splash erosion is caused by the impact of falling raindrops → A–IV
• Saltation is a movement process under wind erosion → B–I
• Erosivity relates to the rainfall factor in erosion → C–II
• Dispersion ratio reflects the impact force needed to detach particles → D–III
Hence, the correct match is: A–IV, B–I, C–II, D–III.