Which celebrity's partnership as a brand ambassador resulted in both reviving their career and dramatically increasing the brand's market share by over 20% within one year?

Celebrity brand ambassadors can completely revitalize a company's image and appeal. Some partnerships have been so successful they've become inseparable from pop culture history. This poll tests your knowledge about one of the most significant brand ambassador transformations that changed both the celebrity's career trajectory and the company's market position. Can you identify which celebrity-brand partnership marked a pivotal moment in advertising history?

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Matthew McConaughey for Lincoln Motors (2014)
Robert Downey Jr. for HTC (2013)
Samuel L. Jackson for Capital One (2013)
Michael Jordan for Nike's Air Jordan line (1984)