Omar, before you can begin to answer even one of these essays, you have to examine the question in relation to what you have to offer the UGrad program. Of the two prompts, which one do you identify with best? Do you see yourself as a leader with a capacity to enact change in your community? Or are you more of a civic leader who has already shown some sort of leadership skills?
In the sense of the Ronald Reagan prompt, you should portray yourself as an idealist who was able to inspire some sort of change in your community, by inspiring others to become leaders and movers themselves. While Martin Luther King Jr. asks you to be the leader that will be followed in the community. Which leadership persona do you embody more? Are you the inspiring leader or the leader who leads through action?
Unfortunately, nobody here can tell you which essay to respond to. Neither can we tell you how to begin answering either of the questions. The choice of question to answer depends upon how you view your leadership skills. Either you identify with Pres. Ronald Reagan, or you identify with civic leader Martin Luther King Jr. Examine your abilities and decide whom your skills best represent and then work on drafting your essay based upon your perceived skills. That will be the best way to start responding to either question. We will be here to assist you in developing your response when you need us.