A flashback tells something from the past so the answer would have to be (A) this is because of the use of the word recall. In every other option the verb is present or future tense instead of past tense.
Answer:
Under President Obama's leadership, the US is advancing policies that address climate change by promoting energy efficiency in our homes, cars and businesses, increasing the domestic production of clean energy—including biofuels—and by investing in renewable energy technology. ...The United States is also vigorously engaged in international climate negotiations while continuing to work with Congress on domestic climate legislation..
Explanation:
The themes are grief, negativity, and depression. You can see this through the mood of the protagonist and the overall mood of the story.
