Hello,Please help with these questions, I have a quiz in a week

18. According to our discussion in class, why are many economists excited about the research program of the Randomistas? A.) Randomized experiments offer a way of establishing causality when studying the relative importance of geography, institutions, and culture on national economic development. B.) By clearly establishing causal effects of potential policies, randomized experiments can improve policies intended to increase the well-being of people living in developing countries today. C.) Both of the above. D.) None of the above. 19. Paul David's 1990 paper, "The Computer and the Dynamo," argued that rapid advances in computing technologies A.) Were unlikely to benefit labor L because computers are part of the capital stock K. B.) Would result in higher productivity only after firms learned the best ways to incorporate computing technology into their individual production processes. C.) Are not well modeled by the Solow Model, which assumes that technological progress is exogenous. D.) Were likely to be less important for productivity growth than the incorporation of electricity into manu- facturing plants in the early 20th century