In each of the questions below, three sentences are given, each divided into four parts. Identify the part(s) that contain grammatical errors and choose the option that correctly represents the combination of erroneous fragments. If no error exists or if the correct combination is not listed, choose accordingly. The emergence of antibiotic-resistant bacterial strains, widely referred to as superbugs, (

• A / represents one of the most serious long-term threats to global public health, (
• A / and agricultural production has dramatically accelerate the development of resistant strains, (
• A / prescribing guidelines and mandatory surveillance programmes to monitor the spread of resistance, (
• B / as conventional drug therapies are becoming increasingly ineffective (
• B / creating a feedback loop in which each failed treatment strengthens (
• B / though experts note that these measures are insufficient (
• C / against infections that were once routinely treatable. (
• C / the pathogen's ability to survive subsequent pharmaceutical interventions. (
• C / without corresponding reductions in agricultural antibiotic use worldwide. (
• D Scientists have warned that the overuse of antibiotics in both clinical settings (
• D Regulatory authorities in several countries have began implementing stricter (
• D