Step 1: Money Market Fundamentals.
- The money market is for short-term financial instruments (e.g., Treasury bills, Commercial paper) with maturities up to one year.
- Medium and long-term securities belong to the capital market, not the money market.
Step 2: Option Evaluation.
Option (D) is incorrect as it wrongly claims the money market handles medium and long-term securities.
Conclusion: The erroneous statement is (D) "It deals in medium and long-term securities."