This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to make money as oil prices rise
Do research.
No matter what you're investing in, you need to make sure you go into the decision as well informed as possible. Reading an investment's prospectus is a good start, but your research should not end there.

Possible answers:
(a). You need to research an investment before you buy in. You need to look at the historical returns on an investment.
(b). Read industry publications, read magazines, and survey websites to get a better idea of the market for oil. Find sources you like before making any investment, just in case the sources aren't reputable or trustworthy.
(c). Research will have much more to do with what you need, who you are investing with, and exactly what your current profit and loss goals are. Decide whether you want " hard " or " soft " investments.
(d). Research what kind of oil-related investments are most likely to be profitable. Understanding the price range of oil-related investments helps you to draw up an accurate account.
The answer is:
(a).