The options you provided seem to have some similarities and possibly a typo in option C, which looks like a repetition of option B. However, based on the information given, the correct choice for a difference between Mardi Gras and Carnival Ponceno is:
A. Mardi Gras is celebrated before Lent
This option highlights a key aspect of Mardi Gras as it specifically marks the last day before Lent begins in the Christian calendar. The other options may also reflect characteristics of Mardi Gras, but they do not distinctly highlight a difference compared to Carnival Ponceno.