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taskmasters
There are two possible answers to the question. I am choosing between 2 and 3.

2 and 3 can be the scale factors that produces and expansion under a dilation of the original image.

The original image is represented by 1. It is a dilation if the scale factor is more than 1. The value of the scale factor will increase if the dilated image is expanded. 
calculista

Let

x--------> original image

y-------> modified image

F------> scale factor

we know that

[tex]y=Fx\\ \\F= \frac{y}{x}[/tex]

if the scale factor produce an expansion under a dilation

then

[tex]y > x[/tex]

[tex]\frac{y}{x} > 1\\ \\F > 1[/tex]

therefore

the answer is

[tex]2[/tex] and [tex]3[/tex]

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