Which of the following statements is true about the law of diminishing marginal What is agricultural economics primarily concerned with? 1 Point Assessing the environmental impact of agricultural practices Analyzing the economic factors and principles that affect agriculture Developing new farming techniques and technologies The study of plant and animal biology in agricultureeturns? As more units of a variable input are added to fixed inputs, the marginal product of the variable input decreases. As more units of a variable input are added to fixed inputs, the marginal product of the variable input increases. As more units of a variable input are added to fixed inputs, the total product remains constant. As more units of a variable input are added to fixed inputs, the total cost of production decreases