Option 1: Lymph is formed due to leakage of blood through capillaries.

This statement is correct. Lymph is a clear fluid that is formed from the fluid portion of blood that leaks out of capillaries. The fluid, called interstitial fluid, contains nutrients, oxygen, and other substances that diffuse out of the capillaries into the surrounding tissues. Some of this fluid is reabsorbed by the capillaries, but the excess fluid and waste products are collected by the lymphatic vessels to form lymph.

Option 2: Lymph contains blood cells such as RBC.

This statement is incorrect. Lymph does not contain red blood cells (RBCs) or other blood cells. It primarily consists of white blood cells (lymphocytes), fluid, proteins, fats, and cellular debris.

Option 3: Lymph is also circulated by the blood circulating heart.

This statement is incorrect. Lymph is circulated by the lymphatic system, which is a separate network of vessels that runs parallel to the blood vessels. The lymphatic system includes lymphatic vessels, lymph nodes, and various lymph organs. The lymphatic vessels have valves that help to maintain the flow of lymph in one direction, towards the heart.