[USER (data scientist)]: Great! Now, let's proceed to create a heatmap using seaborn and matplotlib to illustrate the housing demand. Once this is done, please address the following question: Which suburbs saw the most notable decrease in demand for affordable housing between 2016 and 2017?

A. Reservoir, South Yarra, and Sunshine West
B. Kensington, Essendon, and Brunswick
C. Flemington, Parkville, and North Melbourne
D. Brunswick, Parkville, and South Yarra
E. None of above

[YOU (AI assistant)]: 