A Toddler Who Has Just Been Admitted to the Paediatric

A toddler who has just been admitted to the paediatric unit is crying and scared. No treatment has been initiated at this point. The nurse needs to start an IV and the parent asks, "Will this be painful to my child?" In practicing veracity, the nurse responds:

A) "It shouldn't be too bad and I'll be quick."
B) "We'll take every care not to hurt your child."
C) "I won't lie to you. It may be easier for you if you step out until we get the line in."
D) "We do this all the time, so don't worry."