Which transformations map the strip pattern onto itself?
dp dp dp d
a horizontal translation and a 180° rotation
a horizontal translation and a reflection across a vertical line
a horizontal translation and a glide reflection
a horizontal translation only

The best and most correct answer among the choices provided by your question is the second choice.

A horizontal translation and a reflection across a vertical line is the map that has a strip pattern onto itself.

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I’d say letter a..