A Study to Evaluate the Safety and Efficacy of Ombitasvir/ABT-450/Ritonavir With Sofosbuvir With or Without Ribavirin in Adults With Chronic Hepatitis C Virus Infection

1. Chronic HCV infection prior to study enrollment. 2. Screening laboratory results from the central clinical laboratory indicating HCV genotype 2 or 3 infection only (no mixed genotype). 3. Absence OR presence of cirrhosis. 4. If cirrhotic, need to have compensated cirrhosis and absence of hepatocellular carcinoma (HCC)

1. Positive screen for hepatitis B surface antigen or anti-human immunodeficiency virus antibody 2. Recent (within 6 months prior to study drug administration) history of drug or alcohol abuse. 3. Current enrollment in another clinical study, previous enrolment in this study, or previous use of any investigational or commercially available anti-HCV therapy (other than interferon, pegIFN, RBV, and or SOF) including previous exposure to telaprevir, boceprevir, ABT-450, or ombitasvir (ABT-267). 4. Subjects without cirrhosis: Any current or past clinical evidence of cirrhosis. 5. Abnormal lab tests. 6. Females who are pregnant or plan to become pregnant or breastfeeding, or males whose partners are pregnant or planning to become pregnant