Which of the Following Create Higher Risk for Digoxin Toxicity

Which of the following create higher risk for digoxin toxicity? Both the cause and the reason for it must be correct.

A) Older adults due to reduced renal function
B) Administration of aldosterone antagonist diuretics due to decreased potassium levels
C) Taking an antacid for GERD because it increases the absorption of digoxin
D) Doses between 0.25 and 0.5 mg/day