Final answer:
The line from the poem 'Summer' implies that the speaker senses summer moving forward with purpose, indicating that seasons change with determination. Therefore the correct answer is C. Summer is purposefully advancing forward.
Step-by-step explanation:
The line from the poem, "Summer," suggests that the speaker feels a sense of purpose or intent expressed by summer as it transitions from spring. The correct interpretation is that summer is purposefully advancing forward (Option C). This implies a natural progression of the seasons, with summer moving on with resolution, possibly indicating change or a new phase following spring. The speaker senses this progression as deliberate, which contributes to the thematic element of the poem regarding the relentless march and transformation of seasons.