Question

Merrily, we roll along over the deep blue sea.

What does the word merrily modify in the sentence above?
A.
when we roll along
B.
where over the deep blue sea
C.
how we roll along
D.
why we roll along the sea

Answer 1

C is correct because when they role along, they are happy. That's how they role along. If that makes sense. They are merry when they do it. They role along merry, over the ocean.
~Deceptiøn

Answer 2

C. would be your correct answer, because it is describing how you are traveling on the sea.

Hope this helps, feel free to ask me for help anytime :)