Which of the following best completes the proof showing that δwxz ~ δxyz?

since segment xz is perpendicular to segment wy, angles wzx and xzy are both right angles and congruent. the proportion shows the corresponding sides are proportional, so the triangles are similar by the sas similarity postulate.

6 over 12 equals 3 over 6
6 over 3 equals 6 over 12
6 over 6 equals 3 over 12
12 over 6 equals 3 over 6