The correct answer is: B. extremely safe
S&P triple-A and double-A rating bonds are classified as extremely safe. This means that they are considered to be very low-risk investments. These bonds are typically issued by governments or large, well-established companies. They are considered to be very safe because the issuer is very likely to be able to repay the loan.
Option A is incorrect because extremely discounted bonds are bonds that are selling for less than their face value. This is usually because the bond issuer is considered to be a risky investment.
Option C is incorrect because extremely risky bonds are bonds that are considered to be a high-risk investment. This is usually because the bond issuer is not considered to be a reliable investment.
Option D is incorrect because extremely inflated bonds are bonds that are selling for more than their face value. This is usually because the bond issuer is considered to be a very safe investment.