The answer is indeed letter C) This excerpt shows influences of the Romantic movement because it focuses on the awe-inspiring power of nature.
Romanticism came as a response to the Enlightenment period. The latter used to rationalize nature while the former tried to mend man's relationship with it. So, nature is not only a common theme in Romantic literature, but it is also seen as something divine, to be worshiped, love inspiring.
In I Wandered Lonely as a Cloud, the author William Wordsworth narrates the memory of a day when he and his sister came across a field full of daffodils. The memory of such beauty still makes his heart fill with happiness, even when he is alone.