Answer:
Option B.
Step-by-step explanation:
It is given that △ABC is reflected to form △A'B'C' .
It is given that the vertices of triangle ABC are A(4,1), B(6,3) and C(2,4).
From the given figure it is clear that vertices of triangle A'B'C' are A'(-4,1), B'(-6,3) and C(-2,4).
The relation between preimage and image is defined by the rule
\((x,y)\rightarrow (-x,y)\)
Reflection across y-axis represented by the above rule.
It means the △ABC is reflected across the y-axis to form △A'B'C' .
Therefore, the correct option is B.
