Concept:The phrase "under siege" means facing continuous attack or pressure from others.Explanation:When a company is "under siege from the public," it means the public is attacking or putting pressure on the company.This attack is usually in the form of harsh complaints or negative remarks.Such pressure is best described as criticism.Being applauded, picketed, or shielded does not match the idea of public pressure expressed as negative opinion.Therefore, the most appropriate interpretation is that the company is being criticized.Answer:C. criticized