Research Philiosophie in Finance Research

Which of the social science research philosophies presented in the module (see sources: Book Final, Hopper Powell) is most appropriate for your own PhD project (see research proposal with 3 main questions)? Justify your choice and debate why other relevant social science research philosophies are less suitable. 

A critical assessment of those philosophies has the be included in this 3500 word essay. 
The research questions (see research proposal & m1 research questions) may relate also perhaps to the natural selection paradigm (Darwin, Spencer, Smith et al) as with the research a trading strategy is pursed which better selects stocks that generate higher returns. In addition, the capital cycle (ROIC, ROE) somewhat reflects also a natural cycle just applied to businesses.