In stanza 5 of Robert Frost's poem "Going for Water," a happy tone is developed through imagery that conveys the characters' anticipation and excitement as they listen for the brook. The lines describe the children as "gnomes that hid us from the moon," which adds a sense of playful secrecy and joy to their actions. They pause with "staying hand" to listen, illustrating their eagerness and shared experience in this moment. The imagery creates a picture of innocent wonder, emphasizing their delight in the adventure, thus fostering a happy tone throughout the stanza.
Additionally, while other options may explore different tones or utilize various literary devices, the imagery associated with their playful hiding and collective anticipation most strongly supports the happy tone in this part of the poem.