The answer is D. "Plants about to sprout."
Given the context and the title of the passage, plants sprouting is the most logical choice. When the passage says, "Rooted, they grip down and begin to awaken," you can come to the conclusion that the author is referring to plants since the passage is about spring.
Answer: An agricultural people, whose chief interest is the export of a commodity required in every manufacturing country, our true policy is peace, and the freest trade which our necessities will permit
Explanation: Just took the test
Mia's cat
Mark's crayons
Dad's arms
Clint's shirt
Sarah's tools
Hope this helps.