Which of the following types of soil has the largest particle size? 

Sand has the largest particle size among the given soil types.

Soil is typically classified based on the size of its mineral particles. The three main soil types based on particle size are sand, silt, and clay.

Sand particles are the largest of the three, with a diameter between 0.05 mm and 2.0 mm. Sand particles are visible to the naked eye and feel gritty when rubbed between the fingers.

Silt particles are smaller than sand particles, with a diameter between 0.002 mm and 0.05 mm. Silt particles are not visible to the naked eye and feel smooth and powdery when rubbed between the fingers.

Clay particles are the smallest of the three, with a diameter of less than 0.002 mm. Clay particles are not visible to the naked eye and feel sticky and plastic when wet.

Loam soil is a mixture of sand, silt, and clay, with roughly equal proportions of each. Loam soil is considered the ideal soil type for plant growth because it has good drainage and water-holding capacity, and is rich in nutrients.

So, "sand" is the correct answer as sand has the largest particle size among the given soil types.