Step 1: Understanding SEBI.
SEBI (Securities and Exchange Board of India) is the regulator of securities and commodities markets in India. It has multiple regional offices located across the country to monitor and regulate the functioning of the securities markets.
Step 2: Analyzing the options.
(A) Delhi: Correct. Delhi has a regional office of SEBI.
(B) Kolkata: Correct. Kolkata also has a regional office for SEBI.
(C) Chennai: Correct. Chennai, too, has a SEBI regional office.
(D) All of these: Correct. SEBI has regional offices in Delhi, Kolkata, and Chennai.
Step 3: Conclusion.
The correct answer is (D) All of these, as SEBI has regional offices in all three cities mentioned.