The tone of "To a Waterfowl" is
A.) Formal and religious
B.) Plain and humorous
C.) Melancholy and frivolous

A. formal and religious

Explanation:

The tone, in literature, refers to the expression of author's attitude, shown through the choice of words, level of formality, use of syntax etc.

"To a Waterfowl" is William Cullen Bryant's poem telling us about a bird flying high in the air. The author looks at this bird, admiring it and wondering about its destination. He presumes that the bird had flown the entire day, without stopping to rest its weary wings.

He then continues to wonder about the force driving this bird to its destination, leading it and giving it the strength to fly.

He calls this force the Power and believes that the very same Power guides him through life, giving the poem a religious tone.