Which of the following is not a type of savings account?
Savings account is defined as any bank account that yields interest over a period of time. Savings bond, Certificate of deposit(CD) and basic savings are all types of savings. These will earn interests over the initial amount in certain period of time.
But stock market is not a type of savings, rather its a platform where one buys and sells stocks.
So, D - stock market saving is the correct option.