Which of the following drug combination has (have) been effective therapy for the treatment of Helicobacter pylori

Which of the following drug combination has (have) been effective therapy for the treatment of Helicobacter pylori?
l. Clarithromycin/ ranitidine bismuth citrate
ll. Omeprazole/ clarithromycin
lll. Ciprofloxacin/ erythromycin

A. l only
B. ll only
C. l and ll only
D. ll and lll only
E. l ,ll and lll