Remember: Bharti–Wal-Mart JV was India's entry point for the retail giant.
Step 1: Background. In 2007, Wal-Mart entered into a joint venture with India's Bharti Enterprises for cash-and-carry operations.
Step 2: Partnership ratio. The partnership was structured as 50:50 for wholesale retail operations in India.
Step 3: Eliminate wrong options.
- Mahindra → automobile group.
- Sahara → conglomerate, not in retail JV with Wal-Mart.
- Vodafone → telecom company.
\[ \boxed{\text{Bharti Group}} \]