Which expression is a difference of two terms that is equivalent to -6z + 13?
A. (5z + 2) - (11z - 15)
B. (11z +2) - (5z + 15)
C. (11z + 15) - (5z + 2)
D. (5z + 15) - (11z + 2)

Please answer, I would really appreciate it