Final answer:
Paul Pontallier option (b), the esteemed Bordeaux winemaker, died on December 11, 2018, while Peter Mondavi, a key figure in Californian wine history, passed away on March 2, 2019, at the age of 94.
Step-by-step explanation:
The famous Bordeaux winemaker who died on December 11, 2018, was Paul Pontallier, and the Californian winemaker who left us on March 2, 2019, at the age of 94 was Peter Mondavi.
Paul Pontallier was renowned for his work at Château Margaux, one of Bordeaux's most prestigious estates. He served as the managing director and was deeply respected for his contributions to the wine industry.
Peter Mondavi was a legend in the Californian wine scene, particularly known for his long tenure at Charles Krug Winery, which played a significant role in the development of Napa Valley as a renowned wine-producing region.