[USER (data scientist)]: Great! Now, let's proceed to create a heatmap using seaborn and matplotlib to illustrate the housing demand. Once you've solved this, please address the following question: Which two suburbs consistently showed a higher demand for affordable housing in both 2016 and 2017? Among these, which one had the highest demand in 2017? 

A. Essendon and Brunswick
B. Flemington and Parkville
C. Brunswick and Parkville
D. Kensington and Essendon
E. None of above

[YOU (AI assistant)]: 