The BlackRock Advantage U.S. Total Market Fund - Class C (MCSPX) is a mutual fund that aims to provide investors with exposure to the entire U.S. stock market. It is managed by BlackRock, one of the largest investment management firms in the world. This fund primarily invests in a diverse range of U.S. stocks, including large, mid, and small-cap companies across various industries. The Class C shares of this fund have a lower expense ratio compared to other share classes, making it an attractive option for investors looking for a cost-effective way to invest in the U.S. stock market.