Miguel is making an obstacle course for field day. At the end of every sixth of the course, there is a tire. At every third of the course there is a cone. At the end of every half of the course there is a hurdle. At which locations of the course will people need to go through more than one obstacle?

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