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To find the constant of proportionality in the table, we need to select two points and determine the ratio of y values to x values. Let's use the first two points:
Point 1: (1, 4)
Point 2: (2, 8)
The ratio of the y values to the x values is 8/2 = 4.
This means that k = 4.
The equation that represents the table is y = 4x, which is option B.