Card 13 / 180: In order to stock the appropriate types of foods in its store, a local grocery chain conducts a voluntary survey of its customers as they leave the store. The survey asks for the total number of persons living in the customer's household. Calculate the mode number of household members based on the following numbers from the first ten surveys: 3, 6, 4, 9, 2, 3, 4, 9, 5, 4.
A) 4
B) 9
C) 3
D) 6

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