Which steps would prove the circles similar?

Translate the circles so they share a common center

point, and dilate circle Y by a scale factor of 4

Translate the circles so the center of one circle rests on

the edge of the other circle, and dilate circle Y by a scale

factor of 4

Translate the circles so they share a common center

point, and dilate circle Y by a scale factor of 3

Translate the circles so the center of one circle rests on

the edge of the other circle, and dilate circle Y by a scale

factor of 3