A study investigаtes hоw sоil bаcteriа influence the nitrоgen cycle and, in turn, plant growth. Different densities of soil bacteria are added to separate soil samples to test their effect on nitrogen availability. Plants are grown in each soil sample for four weeks, and their growth is measured regularly. By comparing plant growth across the four scenarios, researchers can determine how varying levels of soil bacteria impact nutrient availability and plant development. Scenario Soil Bacteria Density (cells/g soil) A 1 × 10⁵ B 5 × 10⁵ C 1 × 10⁶ D 2 × 10⁶ Which scenario will result in the least plant growth over the experiment time frame?