Question

Which of the following blood cells is involved in antibody production?
A. B-Lymphocytes
B. T-Lymphocytes
C. RBC
D. Neutrophils

Answer 1

Blood is a body fluid in humans and other animals that delivers necessary substances such as nutrients and oxygen to the cells and transport metabolic waste produced away from those same cells.

Step by step answer:
Antibodies are proteins released by B-cells present in the blood. B-cells target and work against a specific antigen responsible for generating immune response. These B-cells are a type of lymphocytes and hence also referred to as B-Lymphocytes. B lymphocytes belong to white blood cells and are agranulocytes.
Hence option A is correct.
Some additional information :
In vertebrates, blood is composed of blood cells suspended in the plasma of blood. Plasma which constitutes 55% of blood fluid is mostly water and contains protein, glucose, minerals, ions, hormones and carbon dioxide, and blood cells themselves. The blood cells are mainly red blood cells also known as erythrocytes, white blood cells also known as leukocytes, and platelets also known as thrombocytes.
The most abundant cells in vertebrate blood are red blood cells. Red blood cells contain haemoglobin, an iron-containing protein that facilitates oxygen transport by reversibly binding to this respiratory gas and greatly increases its solubility in blood. In contrast, carbon dioxide is mostly transported extracellularly as bicarbonate ions transported in plasma. Vertebrate blood is bright red when its haemoglobin is oxygenated and dark red when it is deoxygenated.

Note: Some animals such as crustaceans and mollusks, use hemocyanin to carry oxygen instead of haemoglobin. Insects in some molluscs use a fluid called hemolymph instead of the blood.