Answer:
b. your stage in life
Explanation:
One of the things you should consider when determining the time frame of your investment goals is - your stage in life
Though you should also consider you liquidity needs, as if you have planned something bigger in the near future, you will need the money.
But here out of all the options we will consider the option - your stage in life.
This is because, if you are already 70 years and wants to invest somewhere, you cannot look for 30 years investment. Buy yes if a person is 30 years old, he can invest with a time frame of 30 years.