Fibrinogen forms fibrin strands during coagulation. These strands form a network whose meshes are occupied by blood cells; this structure finally forms a clot. Antibodies are derived from the $\gamma$-globulin fraction of plasma proteins, which means globulins are involved in defence mechanisms. Albumin is a plasma protein mainly responsible for blood colloidal osmotic pressure (osmotic balance). Correct match: a-ii, b-iii, c-i.