What happens next in this paragraph?

How to buy premium bonds
Decide if ns&i premium bonds are right for you.
Ns&i premium bonds are a savings account you can put money into and redeem at any time without penalty. Note that you cannot get withdraw your investment instantly like a bank account or isa.
Possible answers:
a). With these bonds, the interest you earn is based on a lottery system. Your bond number is put in a system that randomly draws a certain number of bonds per month one calendar month after purchase and will continue to be entered until you cash in your bonds..
b). Determine if passive bonds are right for you. Passive bonds are a small monthly deposit that you purchase only when you want to spend more of the investment..
c). In fact, you can only withdraw for an immediate period of time. Check with the currently pending sale rates for premium bonds..
d). This is because you have to withdraw every month, whether you deduct from that a certain percentage of the investment or withdrawal a percentage of any difference. There are zero-line premium bonds, because only about 3% of the investment is in your account..
a).