Recently,Shelly Joined the Comato Group,an Interest Group That Advocates the Consumption

Recently,Shelly joined The Comato Group,an interest group that advocates the consumption of organic food and speaks against the use of chemicals in farming.Shelly claims that the benefits offered by the group to its members is what motivated her to join the group.The member benefits include a free supply of ingredients for organic farming and discounts on organic food products.What type of incentive motivated Shelly to join The Comato Group?​ 

A) Purposive incentive 
B)  Solidary incentive​ 
C)  Intangible incentive​ 
D)  Material incentive​ 
E) Immaterial incentive