Which of the following is correct?

Blood examination of an anemic person reveals large,immature,nucleated erythrocytes without hemoglobin. Which of the following,if added to their diet,would alleviate the symptoms?

Which $\text{WBCs}$ are phagocytic cells that destroy foreign organisms entering the body?

Which protein is present in blood plasma?

Which type of $WBCs$ are most abundant in the blood of rabbits and other vertebrates?

Identify the cells and their functions based on the provided figure:
$(a)$ Fig. $A$ - Megakaryocyte - formation of platelets
$(b)$ Fig. $B$ - Lymphocyte - synthesis of antibodies
$(c)$ Fig. $A$ - Eosinophil - secrete antihistamine
$(d)$ Fig. $A$ - Neutrophil - secrete heparin