The correct options are
A Urea
B Uric acid
C Creatinine
Humans have two kidneys and each kidney is supplied with blood from the renal artery. These kidneys filter the blood and remove nitrogenous wastes like urea, salts, excess water, and excretes them in the form of urine. If these wastes are not removed, toxic substances accumulate in the blood, which is harmful to our body. Infact, accumulation of toxic substances may even lead to death.
Carbon dioxide being a gas is removed by the lungs by exhalation.