(B) Yes, bonds are assessed based on their credit quality.
Most Bond/Debenture issues are rated by specialised credit rating agencies such as CRISIL, CARE, ICRA and Fitch. The yield on a bond varies inversely with its credit rating.
Source: Chapter 4, Section 4.2.2 – Debt Investment
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The passage explicitly states that most bond/debenture issues are rated by specialised credit rating agencies, confirming that bonds are assessed based on credit quality. Option (B) is correct. Option (C) is a contradictory statement (says "No" but then gives a correct fact). Option (D) incorrectly credits RBI. Remember: safer bonds carry lower interest rates — yield and credit rating are inversely related.