Buying a treasury bill (T-Bill) is best for investors who are looking for what?

Treasury bill is good for a long term investment that is stable.

Explanation:

Treasury bill is best for the investors who are looking for a long term investment and do not want to take out the money anytime between the period that the bill is offered for.

This also allows for a pre decided rate that will give them the same rate of return no matter what the market is like at that time.

This is the kind of bond thus, that one must take if they are looking to keep their money secure for some amount of time without hope for a lot of profit.