\dfrac{z}6=\dfrac12 6 z = 2 1 start fraction, z, divided by, 6, end fraction, equals, start fraction, 1, divided by, 2, end fraction z=z=z, equals rectangle with 1 of 2 equal parts shaded. Same-sized rectangle with 6 equal parts

What is the next step in the given proof? choose the most logical approach. a. statement: m 1 + m 2 + 2(m 3) = 180° reason: angle addition b. statement: m 1 + m 3 = m 2 + m 3 reason: transitive property of equality c. statement: m 1 = m 2 reason: subtraction property of equality d. statement: m 1 + m 2 = m 2 + m 3 reason: substitution property of equality e. statement: 2(m 1) = m 2 + m 3 reason: substitution property of equality