Explanation:

- The sentence describes a scene at an elephant camp at dusk. It's a tranquil setting with the tranquil activity of feeding the elephants.

- The phrase in blank (3) should indicate the presence of the Forest Department staff around the tusker during dinner time.

- Option 1: "nowhere" implies absence, which doesn't fit the context as it describes a scene with active elements and people present.

- Option 3: "everywhere" suggests an exaggerated ubiquity that doesn't match the specific mention of half-a-dozen people.

- Option 4: "here" is possible, but it is more common to use "there" to describe the presence of people within such a narrative framework.

- Option 2: "there" fits naturally as it simply states that the Forest Department officials are present at the scene.