Answer:
Sarah has invested in sole proprietorship while Jane has invested in corporations
Explanation:
Sole proprietorship is owned and run by a single owner who is legally obligated for all business assets and liabilities. Since Sarah has invested thousands of dollars in one company, it looks like she has invested in sole proprietorship in which she is the owner.
Corporation is run by group of people who are not legally obligated for the assets and liabilities of the corporation. People can invest in more than one corporation as they are open for public offer. These investors earn dividends based on the earnings earned by the corporations So, possibly Jane has invested hundreds of dollars in different large companies.