Final answer:
The antibiotic crisis is characterized by the overuse of antibiotics leading to increased resistance among bacteria, resulting in difficult-to-treat infections and a shortage of effective new antibiotics in development.
Step-by-step explanation:
The crisis related to antibiotics is best described by option c) Overuse of antibiotics has led to resistance. The widespread use of antibiotics has resulted in the evolution of antibiotic-resistant strains of bacteria. These resistant bacteria are a significant concern for the medical community as they can cause infections that are difficult to treat with existing antibiotics. In the United States, antibiotic resistance leads to at least 2 million serious infections and 23,000 deaths every year. The antibiotic crisis is exacerbated by the fact that it takes considerable time and financial investment to develop new, effective antibiotics. This has led to a situation where fewer drugs are available in the pipeline to combat evolving 'superbugs', and existing drugs are becoming less effective due to resistance.