Step 1: Understanding the poem.
The extract is from the poem "Fire and Ice" by Robert Frost. In this poem, the poet mentions that some people believe the world will end in fire, while others believe it will end in ice.
Step 2: Analyzing the options.
(A) smoke: Incorrect, not mentioned in the poem.
(B) water: Incorrect, the poem mentions "ice," not water.
(C) sea: Incorrect, there is no mention of sea.
(D) fire: Correct, as directly mentioned in the poem’s first line.
Step 3: Conclusion.
The correct answer is (D) fire.