A 45-year-old with dyspepsia tests positive for H. pylori on stool antigen; no prior treatment and no antibiotic susceptibility data. Which initial eradication regimen aligns with current U.S. guidance?AClarithromycin triple therapy for 10-14 days regardless of resistance patternsBBismuth quadruple therapy for 14 daysCLevofloxacin triple therapy for 7-10 days as first-lineDMetronidazole monotherapy for 14 daysENo therapy is recommended unless peptic ulcer is presentCheck my answer