Final answer:
Anemia is the correct answer to the question, as it refers to a blood disorder where there are insufficient red blood cells to transport oxygen effectively, leading to symptoms like weakness and fatigue.
Step-by-step explanation:
“Anemia, which is a decrease in the amount of RBC or erythrocytes, results in insufficient hemoglobin available to transport oxygen.” The correct answer to this question is a. Anemia. Anemia is a disorder characterized by having an inadequate volume of red blood cells, which are responsible for carrying oxygen to the body's cells. Hemoglobin, which is contained within these red blood cells, is crucial for oxygen transport.
Anemia can be caused by various factors, including blood loss, the destruction of red blood cells, and a lack of production of red blood cells. Symptoms such as weakness and fatigue result from the reduction in the amount of oxygen that gets to the cells of the body.