Help! Acid-Base Imbalances

My professor gave us a couple of practice problems. For the most part I understand, but I want to be sure.

So we had,

Client A: pH= 7.1

pCO2= 40 mm Hg

[HCO3] is low

My answer: Metabolic Acidosis.

My rationale: The pH is low, so it reflects acidosis

pCO2 is normal because its between 35-45 mm Hg

The HCO3 is low, so its a metabolic problem

Client B: pH= 7.1

pCO2= 60 mm Hg

[HCO3] is normal

My answer: Respiratory Acidosis.

My rationale: The pH is low, so it reflects acidosis

pCO2 is high because the normal pCO2 is 35-45 mm Hg. So since its high its a respiratory problem.

Client C: pH= 7.25

pCO2= 65 mm Hg

[HCO3] is high

My answer: Respiratory Acidosis Compensation.

My rationale: The pH is normal.

pCO2 is high because its above 35-45 mm Hg

The HCO3 is high also.

So since the PCO2 is high and the HCO3 is high its a compensation.

For Client C how do you determine if its Respiratory or Metabolic if their moth abnormal?