Most people invest in the stock market without doing any research of their own. Some of these people rely solely on their broker' s advice, whereas some others make decisions based merely on hunches. Other people do some research of their own, but just as often rely only on their broker or on hunches. Only a few always do their own research before investing. Nonetheless, a majority of investors in the stock market make a profit. If the statements in the passage are true, which one of the following must also be true? ['Most people who rely solely on their broker rather than on hunches make a profit in the stock market.', 'Most people who invest in the stock market without doing any research of their own make a profit.', 'Some people who do investment research on their own, while just as often relying on their broker or on hunches, make a profit in the stock market.', 'Some people who make a profit on their investments in the stock market do so without doing any research of their own.']