Centennial Tours is trying to decide which one of two tours it will introduce. The costs and revenues associated with each alternative are listed below Tour A Tour B Projected revenue Varlable costs Fixed costs $1500 0) ,0009,000 4,000 4,000 Profit 9,000$5,000 What are the incremental (differential) costs of Tour B? $4,000 O $7000 o $3,000 ONone of these.