You are answering a USMLE-style medical question. Question: A 50-year-old man with congestive heart failure (CHF) was started on an experimental analog of atrial natriuretic peptide. Which of the following would he expect to experience? Options: A) Increased water reabsorption by the renal collecting ducts B) Vasoconstriction, increased blood pressure, aldosterone release C) Increased glomerular filtration rate, restricted aldosterone release, vascular smooth muscle dilation D) Increased plasma calcium and decreased renal reabsorption of phosphate Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.