Final answer:
The poet's word choice in the lines from the poem "In Spite of War" generates a demanding tone, commanding the reader's attention and challenging them to perceive joy even amidst war and death. The correct choice is It creates a demanding tone.
Step-by-step explanation:
In the lines from the poem "In Spite of War," the poet's word choice affects the tone by creating a demanding tone. The imperative "Wake from the nightmare!" immediately commands attention, while "Look and see" invites the reader to consider a different perspective. The phrase "life is naught but ecstasy" juxtaposes the horrors of war with an affirmation of life's inherent joy, which could seem audacious or defiant, hence, demanding. The overall effect is one of insistent optimism in the face of adversity.