Consider the following statements regarding biochemical oxygen demand (BOD) of river water:1. The BOD rate constant varies with river water temperature2. The BOD rate constant does not depend on the BOD of the river water3. The BOD rate constant is often different for different river waters4. The BOD rate constant cannot be determined in a laboratoryWhich of the above statements are correct?

• A. 1 and 4
• B. 1 and 3
• C. 2 and 3
• D. 2 and 4