A person consumes food that contains proteins. Some of the amino acids from these proteins are changed into urea and removed from the body. proteins $\xrightarrow{1}$ amino acids $\xrightarrow{2}$ urea $\xrightarrow{3}$ urine. Which row shows the sites of processes 1, 2 and 3?
- Aprocess 1: stomach; process 2: liver; process 3: kidney
- Bprocess 1: liver; process 2: kidney; process 3: bladder
- Cprocess 1: stomach; process 2: kidney; process 3: liver
- Dprocess 1: liver; process 2: stomach; process 3: kidney