When a salesperson visits your home and asks you to try a free sample of a cleaning fluid, you agree. When he returns the following week and asks you to purchase an assortment of expensive cleaning products, you make the purchase. The salesperson appears to have made effective use ofa. Conformityb. Foot-in-the-door Phenomenonc. Social Reciprocity Normd. Cognitive Dissonancee. Group Polarization

The salesperson appears to have made effective use of b. foot-in-the-door phenomenon.

Explanation:

Foot-in-the-door phenomenon is a tactics used by many of the salesperson to sell their products. Under this technique, they make a customer to agree the large request by making them agree to their small request first.

Foot-in-the-door phenomenon was discovered by the psychologists Jonathan Freedman and Scott Fraser, when they met pedestrian salesmen at their heyday.

In the above scenario, the salesman visits my house and gave some free sample of cleaning liquid to try. He returns back in a week and requests to buy expensive cleaning products. This shows that the salesperson is following foot-in-the-door phenomenon.