What is risk, as pertains to investing?
a. the time period needed to find a buyer for an investment.
b. the cost of purchasing an investment.
c. the chance you take that your investments will lose their value.
d. the opportunity cost of tying your money up in investments.

Option c, The chance you take that your investments will lose their value.

Explanation:

This can be explained with an example –  

Let us suppose that a single  share of a company   "A" value 100 dollars today.

If you purchased 70 shares of company "A" today your total investment would be

dollar

Now if by next year the value of one share of company "A" falld down from  100 to 50 dollars, then the value of your investment after one year would be

dollar

Thus, the total loss in this investment would be

dollar

Thus, risk associated with an investment is basically "The chance you take that your investments will lose their value.".

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e) all of the above