Which correctly uses or omits commas? A. The well-known consumer advocate, Ralph Nader, ran as the Green Party candidate for U.S. President in 2000 and 2004. B. The well-known consumer advocate Ralph Nader, ran as the Green Party candidate for U.S. President in 2000 and 2004. C. The well-known consumer advocate Ralph Nader ran as the Green Party candidate for U.S. President in 2000 and 2004. D. The well-known consumer advocate, Ralph Nader ran as the Green Party candidate for U.S. President in 2000 and 2004.