ANSWER: POLICY
EXPLANATION: POLICY PERSUASIVE SPEECH refers to a speech given to convince an audience to either accept or reject a policy.
However, persuasive speaking on a questions of policy, advocates a change from the status quo (the state of things; the way things are, opposing the original state). Hence, the speaker wants the proposition disseminated in the speech to become policy.
Thus, Emily writing her audience towards their congressional representatives and urge the UN to intervene in an conflict (i.e addressing the state of conditions in Gaza, opposing how it's expected to be), is a persuasive speech on a question of policy.