PLSS HELP ME ASNWER THIS! 25 POINTS!

Answer:
Either B or C not to sure but its one of those I say C actually
Step-by-step explanation:
Answer:
m - 9 + 6k
Step-by-step explanation:
the perimeter is basically the sum of all sides.
hence,
5k - 3 + k + 1 + m - 7 = answer
6k + m - 9 = the expression