Scenario 2-1 Two Home Builders Are Building Homes in Nearby Subdivisions. One

Scenario 2-1
Two home builders are building homes in nearby subdivisions. One is offering 2,500 square foot homes with two-acre yards. The other is offering a similar size of house with quarter-acre yards. The builder offering the smaller lots cannot keep up with demand. The builder offering the larger lots has several unsold houses.
-Refer to Scenario 2-1. What could the builder with the larger lots use to determine why his homes are not selling?

A) proactive customer monitoring  
B) consumer confidence forecasts  
C) demographic information  
D) reactive customer monitoring