Assertion: Stock exchanges provide safety and security in dealings. 
Reasoning: Activities of the stock exchange are controlled by the provisions of the Securities Control (Regulation) Act. 

Both Assertion (A) and reasoning (R) are correct and R is the correct explanation of A.

Provides safety and security in dealings: Activities of the stock exchange are controlled by the provisions of the Securities Control (Regulation) Act and all this creates confidence in the minds of investors. As transactions are conducted as per well-defined rules and regulations, fraudulent practices stand checked effectively ensuring safety, security and justice in dealings.