Step 1: Understand the role of SEBI.
The Securities and Exchange Board of India (SEBI) is the regulatory body responsible for overseeing and regulating the securities market in India.
Step 2: Historical context.
SEBI was established to protect the interests of investors, ensure fair trading, and promote the development of the securities market.
Step 3: Look at the options.
SEBI was officially constituted in 1988, under the Government of India, to regulate the securities market.
Final Answer:
\[
\boxed{1988}
\]