During a Well Child Examination of a 2-Year-Old Child, the Primary

During a well child examination of a 2-year-old child, the primary care pediatric nurse practitioner palpates a unilateral, smooth, firm abdominal mass which does not cross the midline. What is the next course of action that?

A) Order a CT scan of the chest, abdomen, and pelvis.
B) Perform urinalysis, CBC, and renal function tests.
C) Reevaluate the mass in 1 to 2 weeks.
D) Refer the child to an oncologist immediately.