Answer: The answer is B.
The sequence of transformations that produces an image that is not congruent to the original figure is option B: a translation of 4 units left followed by a dilation of a factor of 3.
The translation preserves the shape and size of a figure but moves it to a different location. However, dilation changes the size of the figure, which means that the resulting image will not be congruent with the original figure.