Consider trapezoid LMNP with vertices at points (-2,3), (-2,6), (-1,6) and (-1,4), respectively.
The reflection across the x-axis has a rule:
(x,y)→(x,-y).
Then
- L(-2,3)→L'(-2,-3)
- M(-2,6)→M'(-2,-6)
- N(-1,6)→N'(-1,-6)
- P(-1,4)→P'(-1,-4)
As you can see points L', M', N' and P' form trapezoid L'M'N'P' and this is exactly figure A.
Answer: correct choice is A.
