In evaluating the effectiveness of magnesium sulfate (MgSO4), which of the following might indicate that...

(A) Diminished (not accentuated) patellar tendon reflex is a sign of developing MgSO4 toxicity. A value of 21 is considered a normal tendon reflex; 3+ is considered brisker than normal. (B) MgSO4 is a central nervous system (CNS) depressant. It also relaxes smooth muscle. If the respiratory rate is <16 bpm magnesium toxicity may be developing. (C) Urine output of 40mL/hr is enough to allow elimination of toxic levels of magnesium. Urinary output of <100 mL in a 4-hour period may result in toxic levels of magnesium. (D) Presence of protein in the urine is a symptom of pregnancy-induced hypertension (PIH), a clinical syndrome for which magnesium sulfate is frequently used in medical management. Protein in the urine is not induced by magnesium sulfate intake.