Dissertations / Research Paper on HR topics, help me select one from the list [3]

Hi, I am pursuing MBA in HR. i need to work on a research project. There are some topics which i have thought of like "employee retention technique", "Competency Mapping", "Attrition Analysis based on Exit Interviews", "Hr accounting". I would like your guidance in helping me to select one among the given list. would like to know how should i proceed ahead in my research work..

Thanks & Regards