What is the next step in the given proof? choose the most logical approach.
а.
statement: ab= de
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
statement: ce = de + ef
reason: transitive property of equality
e.