Pradhan Mantri Jan Dhan Yojana has been launched for

The correct option is "promoting financial inclusion in the country".

Step-by-step Explanation:

1. Understanding the Scheme: Pradhan Mantri Jan Dhan Yojana (PMJDY) is a flagship financial inclusion program launched by the Government of India in August 2014. The primary goal of this national mission is to ensure access to various financial services for the excluded sections of society, particularly weaker sections and low-income groups.

2. Key Pillars of PMJDY: The scheme is built on six pillars that promote financial inclusion, which include:
- Universal access to banking services with at least one basic banking account for every household.
- Providing basic savings bank accounts with an overdraft facility.
- Financial Literacy Programs to promote savings, use of ATMs, and getting ready for mobile banking.
- Creation of a Credit Guarantee Fund to cover defaults in overdraft accounts.
- Providing micro-insurance to all account holders.
- Offering pension schemes for the unorganized sector.

3. Why other options are incorrect:
- Housing loans: PMJDY focuses on basic banking services and savings accounts, not specifically on providing cheap housing loans.
- Women's Self Help Groups: While PMJDY supports women by targeting household accounts, it is a broad banking scheme rather than a dedicated initiative for Self Help Groups in backward areas.
- Financial help to marginalised communities: Although it helps marginalised communities access banking, its core structural mechanism and primary definition is to drive comprehensive "financial inclusion" across the nation by integrating everyone into the formal banking system.