A. system approach

B. quantitative approach
C. contingency approach
D. modern approach

Some possible complete sentences that are more coherent could be:

- The contingency approach in management emphasizes that there is no one-size-fits-all solution to organizational issues.
- The system approach in management focuses on understanding the interdependencies and interconnectedness of various elements within an organization.
- The quantitative approach in management relies heavily on data analysis and mathematical models to make decisions and solve problems.
- The modern approach in management incorporates current trends and practices, such as technology advancements and a focus on employee well-being and work-life balance.