Read the article and select the best answer. Article: BEIJING---Chinese President Xi Jinping has stressed the need to promote the country's housing security and supply to guarantee people's basic residential needs On Tuesday, Xi said that pushing the construction of the housing supply system is a solid project that benefits all people. ''Solving the housing issue is a long-term task," the president said "China still faces problems such as insufficient affordable housing and imbalances in housing distribution" Xi said future work will sick to market-oriented reform.and properly handle the roles of government and the market, economic and social functions of housing development,relations of necessity and possibility and the difference between housing security and welfare trap Meanwhile,he vowed the government shall meet the basic housing needs of the group troubled by inadaptable labor skills, lack of job opportunities or low income Xi pointed out that the general scheme of building China's housing supply system is that the government realizes most of the basic needs while leaving other diversified demands for the market rules "China will spare no effort to increase housing supply while pursuing affordable, environmentally friendly and safe living standards in accordance with the country's practical situation,"he said According to the country's 12th five-year plan,China will increase its quantity of affordable housing go that it covers 20 percent of all residential areas by 2015 through construction of 36 million affordable housing units,including renovation of run-down neighborhoods Xi said the government will first ensure the quality and safety of these buildings and strive to accomplish the goal while speeding up the construction of public rental and low--rent housing as well as the renovation of run-down neighborhoods Land and financial policies will be further improved to support the project,Xi said,adding the government will explore and encourage ways for non-profit institutions to participate in the construction and management of affordable housing. The... Question: As for solving China's housing problems.President Xi is _ . Options: A: helpless B: pessimistic C: determined D: uncertain
C