Step 1: Overview:
The task is to order prominent Indian financial scams chronologically by their public disclosure date.
Step 2: Timeline:
Here's when each scam was revealed:
A. Harshad Mehta Scam: Exposed in 1992, this involved stock market manipulation.
D. Ketan Parekh Scam: Uncovered in 2001, a stock market scam by a Harshad Mehta associate.
B. Satyam Scam: This corporate fraud, involving account manipulation, came to light in January 2009.
C. PNB Nirav Modi Scam: Publicly known in early 2018, this was a large fraud using fraudulent Letters of Undertaking at Punjab National Bank.
Step 3: Solution:
The chronological order of the scams, based on exposure year:
1. Harshad Mehta Scam (1992) $\rightarrow$ A
2. Ketan Parekh Scam (2001) $\rightarrow$ D
3. Satyam Scam (2009) $\rightarrow$ B
4. PNB Nirav Modi Scam (2018) $\rightarrow$ C
The correct sequence: A, D, B, C.