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Answer:
Option B
Step-by-step explanation:
Scale factor by which the triangle ABC has been dilated to form the image triangle DEF,
Scale factor = [tex]\frac{\text{Dimension of image triangle}}{\text{Dimension of the original triangle}}[/tex]
= [tex]\frac{EF}{BC}[/tex]
= [tex]\frac{1}{2}[/tex]
Therefore, Option B will be the correct option.