What is super Tuesday? CNN 10 March 8 2024

A. Discounted groceries at supermarkets throughout the US
B. Presidential primary election day where more states (15) hold primaries than any other day
C. An act of Congress allowing citizens to "write in" candidates to run for President
D. The main media day before the Superbowl

B. Presidential primary election day where more states (15) hold primaries than any other day