Final answer:
Junk bonds carry significant risk that the issuer will not make current or future payments. So, the correct answer is option D.
Step-by-step explanation:
Among the given options, the bonds that carry significant risk that the issuer will not make current or future payments are junk bonds. Junk bonds are high-yield bonds that have a relatively high chance of defaulting on the payments. These bonds offer a higher rate of return but come with a higher level of risk. Investors can reduce the risk by diversifying their portfolio and investing in bonds from different companies.
So, the correct answer is option D.