8. For the following patients, which one has respiratory alkalosis? (A) pH=7.90, = 19 mEq/L, = 30 mmHg (B) pH 7.05, = 28 mEq/L, = 50 mmHg (C) pH=7.75, = 30 mEq/L, = 44 mmHg (D) pH=6.90, = 18 mEq/L, = 22 mmHg