Answer:
C). Lonely.
Explanation:
Wordsworth is known for his use of diction and style that helps create the desired tone and mood in his poetry. In the given excerpt from "The Daffodils" or "I Wandered Lonely as a Cloud", the words 'vacant' and 'pensive' constitute a 'lonely' tone in the poem that this solitude help him realize his achievement(gains) from the experience as he could now sense the 'pleasure fills' and enjoy 'bliss of solitude' and experience the 'beauty of nature' with 'an inward eye'. Thus, option C is the correct answer.
