Answer: A. Diplomacy
Explanation: Managing and maintaining international relation between countries requires diplomacy which requires the adoption of a careful, tactful and measured approach in dealings or operation in other to foster good and healthy relationship between two independent nations, thereby increasing cooperation and togetherness between the countries. Diplomacy is especially required when the need to achieve a certain goal requires that two or more countries need to come together in other to successfully achieve that target or aim. In the excerpt above, Obama advocated the need for togetherness and cooperation between both countries in other to deal with the ravaging effect of climate change.
Based on the excerpt in the passage above, the foreign policy implementation President Obama was advocating between the two countries is "diplomacy."
Diplomacy is the term that is used to describe the method at which people deal with other in a sensitive and tactful manner, such that both parties can quickly reach a compromise.
Given that President Barak Obama is talking to China and expect them to cooperate on issues concerning them both, this is an act of diplomacy.
Hence, in this case, it is concluded that the correct answer is option A. Diplomacy
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