Arrange the Following Steps of Protein Metabolism in Correct Sequence

Multiple Choice

Arrange the following steps of protein metabolism in correct sequence.
1) Ammonia is converted to urea in the liver.
2) Oxidative deamination of an amino acid.
3) Urea is eliminated by the kidney.
4) Ammonia and keto acids are formed.

A) 1, 3, 4, 2
B) 2, 4, 1, 3
C) 3, 1, 4, 2
D) 4, 1, 3, 2
E) 2, 3, 1, 4