A Patient's Pulse Has Gone from 78 at Rest to 98

A patient's pulse has gone from 78 at rest to 98 after ambulating.What nursing action is indicated at this time?

A) Ask the health care provider to order a wheelchair for the patient.
B) Plan an adequate rest period before and after ambulating.
C) Sit the patient on the bed for 15 minutes before ambulating.
D) Increase the amount of range-of-motion exercises done daily.