Final answer:
The client needs further instruction if they believe they can remove the cast themselves if it gets too tight.
Step-by-step explanation:
The correct answer is d) I can remove the cast if it gets too tight.
Removing the cast without proper medical supervision can be dangerous as it may worsen the injury or cause complications. Casts are used to immobilize a fractured bone and promote healing, so they should only be removed by a healthcare professional. The other statements mentioned (a, b, and c) are all correct and indicate appropriate cast care.