When Assessing a Client's Stoma,the Nurse Notices It Appears Dark

When assessing a client's stoma,the nurse notices it appears dark and dusky colored.The initial intervention is to

A) Do nothing,as this is normal.
B) Document findings and continue to assess the stoma.
C) Replace the pouch with a different type,as this is an allergic reaction.
D) Notify the physician that the stoma is not receiving adequate oxygen supply.