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.
\[
\boxed{\text{Bharti Group}}
\]