The correct answer is B. Iron
Step-by-step explanation
Iron is a necessary mineral because it contributes to the growth and development of the body. One of its main functions is that it is an essential component of hemoglobin (blood protein responsible for the transport of oxygen). Due to this, iron deficit often causes anemia, which is a condition in which the level of hemoglobin is low. According to this, the best supplement for someone suffering from anemia is iron considering a deficit in iron is one of the main causes of anemia and by increasing iron levels hemoglobin should go back to normal levels. So, the correct answer is B. Iron