Janice owns a small coffee shop at a subway station on the Yonge line in Toronto. She normally stocked Natrel lactose$-$free milk, but the grocery store down the street stopped ordering the Natrel brand. The remaining options were TruTaste and Dairy Pure. Janice bought a small carton of each to test them out on her regular customers. They preferred the TruTaste brand, so she kept buying that one going forward. Janice exhibited what type of buying behaviour?

a$.$ Routine response making

b$.$ Extensive decision making

c$.$ Limited decision making

d$.$ Involvement