Place the Following Events in the Correct Sequence of Events

Place the following events in the correct sequence of events when ketoacids increase in the blood of a diabetic patient. Not all options are used in the answers.
1) Serum pH decreases
2) Serum bicarbonate decreases
3) PCO₂ decreases
4) Respiration decreases
5) Respiration increases
6) Serum pH increases
7) Urine pH decreases

A) 1, 3, 7, 4, 2, 6
B) 5, 2, 7, 3, 4, 1
C) 2, 1, 5, 3, 7, 6
D) 3, 1, 2, 5, 7, 6