Given: ab = ce cd = ef prove: ab = df proof: 4 what is the next step in the given proof? choose the most logical approach. a. statement: ab = df reason: substitution property of equality b. statement: de = de reason: subtraction property of equality c. statement: ce = df reason: transitive property of equality d. statement: cd = de reason: substitution property of equality e. statement: ce = de + ef reason: transitive property of equality