In the context of a machine learning project aimed at analyzing customer behavior patterns for a retail chain, you are tasked with selecting the most appropriate data visualization technique to identify correlations between different customer demographics and purchasing habits. The dataset includes variables such as age, income, frequency of purchases, and average spend per visit. Given the need to efficiently communicate these relationships to stakeholders who may not have a technical background, which of the following visualization techniques would be the BEST choice? Choose one correct option.