Step 1: Understanding the Question:
The question asks which company hired the wrestler Sushil Kumar as its brand ambassador.
Step 2: Key Fact or Approach:
Brands often use well known sportspersons to promote their products, and matching the athlete to the right company is a matter of recalling the specific endorsement deal from that period.
Step 3: Detailed Explanation:
Sushil Kumar built his reputation as one of India's most successful wrestlers, with a bronze medal at the 2008 Beijing Olympics and a silver at the 2012 London Olympics.
Around this time, Ralson Tyres, an Indian tyre company, chose him as its brand ambassador, linking his image of grit and physical strength to its tyre products.
MRF Tyres is better known in Indian sport for its cricket bat sponsorships rather than for this wrestling endorsement.
Goodyear and Lego Group have no recorded connection to Sushil Kumar, with Lego in particular being a toy company entirely outside the world of sports endorsements.
Step 4: Final Answer:
Ralson Tyres is the company that appointed Sushil Kumar as its ambassador, so option (b) is correct.