- A Protista
- B Monera
- C Fungi
- D Plantae
Correct answer: A. Protista
Explanation: Dinoflagellates are protists; blooms of them redden the water.
Concept context
Whittaker's five kingdom system covering Monera, Protista, Fungi, plus viruses, viroids, and lichens. A foundational NEET chapter on how living organisms are grouped.