The correct option is B Ammonia and CO2
The principal nitrogenous excretory compound in humans in urea. Urea is produced in a series of reactions (urea cycle), which takes place in the mitochondrial matrix, and cytosol of liver cells. Urea cycle (ornithine cycle) is the series of biochemical reactions, that converts the highly toxic ammonia and carbon dioxide to the much less toxic urea during the excretion of metabolic nitrogen derived from the deamination of excess amino acids. The urea is ultimately excreted in solution as urine.