The optimal opening sentence is "Fii the dolphin lived in the River Kaima with his family," introducing the central character and setting the stage for the narrative about the friendly dolphins and their positive interactions with the river's visitors.
The most suitable opening sentence for the first paragraph would be: OD. Fii the dolphin lived in the River Kaima with his family.
This choice aligns with the narrative's focus on the friendly dolphin named Fii and his life in the River Kaima. The opening sentence should introduce the central character and set the stage for the subsequent details about the river, its cleanliness, and the interaction between the dolphins and the people.
The passage unfolds as a narrative about Fii and his friendly interactions with the river's visitors, particularly the children. It highlights the positive relationship between the dolphins and the people who come to the river. Starting with Fii establishes a personal and engaging entry point for the reader, drawing attention to the protagonist and his connection to the River Kaima.
In summary, initiating the paragraph with "Fii the dolphin lived in the River Kaima with his family" serves as an effective opening, providing a focal point for the narrative and inviting readers into the world of the friendly dolphins and their interactions with the river's visitors.
Therefore , from the given options the correct one is D.