In the examples cited by Robert Claldinl and Steve Martin, when servers provided mints to their customers as they gave them the bIII, the difference In tips from giving one mint versus two mints, jumped from $3$ percent to percent of the bill.

a$.5$

b$.14$

c$.6$

d$.10$

The statement: You will also need to emphasize what they stand to lose if they fall to consider your proposal is Indicative of whlch short cut princlple In persuading others?

a$.$ Reciprocity

b$.$ Liking