Open Question: Investment Portfolio?

I'm doing a project for an AP economics class that has to do with creating a financial investment portfolio that may include stocks, mutual funds, corporate bonds, government securities, certificates of deposits and money market accounts. I've assessed the risk for each of the following and have a general idea of what might need to be done, but does anyone else have input for these clients? 1) Client A has $25,000 to invest over a 10 year period. She wants to make money to pay for tuition when her children begin college. Her two children have just started school. She wants to find investments that will generate returns greater than the money market 2) Client B is 15 years old and has been given a gift of $10,000 to start an investment account to build toward the future. 3) Client C has $100,000 and is 50 years old and wants to retire at age 65. He is a teacher in New York State. Any input on any or all of the above would be really really appreciated! Thanks in advance!