Which description below best describes the motion that could be occuring at section B on the graph above? The bicycle rider is returning home. The bicycle rider is stopped because he got a flat tire. The bicycle rider is speeding up because he is traveling uphill. The bicycle rider has slowed down because he is traveling uphill.

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