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Triangle PQR was rotated using the rule (−y, x) and then dilated by a scale factor of 2 to create triangle P″Q″R″. Which statement explains why the triangles are similar?

Rotations and dilations preserve collinearity; therefore, the corresponding sides of ΔPQR and ΔP″Q″R″ are congruent.
Rotations and dilations preserve angle measure; therefore, the corresponding angles of ΔPQR and ΔP″Q″R″ are congruent.
Rotations and dilations preserve orientation; therefore, the corresponding angles of ΔPQR and ΔP″Q″R″ are proportional.
Rotations and dilations preserve side length; therefore, the corresponding sides of ΔPQR and ΔP″Q″R″ are congruent.