You can B. Say no because informal gatherings are strictly prohibited.
Informal gatherings are social events held for social purposes.
Informal gatherings are not allowed for business discussions and should be rejected when offered for business purposes.
A Decline the invitation because business matters must not be discussed with Outside Business Associates.
B Say no because informal gatherings are strictly prohibited.
C Say yes because you have never attended a business meal with the Outside Business Associate.
Thus, you can B. Say no because informal gatherings are strictly prohibited.
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