Write a few paragraphs, in Spanish, comparing the customs associated with Christmas celebrations in the US and Mexico.

Christmas in Mexico bears only a slight resemblance to an American Christmas. Both Holidays remain grand events in their respective cultures and both are based on the celebration of the birth of Christ Jesus; however, this is where the major similarities conclude. While both countries regard December 25th as the observed date of the event, Mexican Christians focus their celebration on the evening before, December 24th. Christmas Eve in America is still respected as a holy day, but contemporary Christians usually spend this day in preparation for the next. La Navidad, December 25th in Mexico, is considered a holiday but not to the extent of the previous evening.

cuales son las opciones?

corras is the only one that is informal but doesn't follow the suffix rule. correr is the verb. corre is the formal verb form. corra would be used as the formal is corre ended with an a.

your best bet would be corras, it's the only one that is informal but is still wrong