Answer:
Informal Negative Sanctions.
Explanation:
A social sanction can be defined as reaction of society,approving and disapproving someone's actions. Social sanctions can be positive and negative.
In the given case, social sanction is negative. Informal negative sanction can be defined as sanctions that are regulated to discourage, embarrass, public ridicule, criticize, etc. In the given instance, informal negative sanction is used to discourage Charlotte, by not inviting her to block barbecue because her dog creates mess on lawns when left loose.
Therefore, informal negative sanction is the correct answer.
