A client with iron-deficiency anemia complains of feeling fatigued almost all the time. The nurse would respond with which statement?

"Breathing is better when the client is anemic."

"The body has to work harder to fight infection in the presence of anemia."

"Blood flows more slowly when the hemoglobin or hematocrit is low."

"Adequate amounts of hemoglobin are needed to carry oxygen for tissue metabolism."