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For a Jehovah's Witness, who typically declines blood transfusions due to religious beliefs, the focus is on using volume expanders that do not contain any blood products or derivatives. The correct choice of using colloids and crystalloids for volume expansion is suitable because both of these types of fluids can effectively increase intravascular volume and maintain circulation without violating the patient's beliefs regarding blood products.

Colloids (such as hydroxyethyl starch or dextran) are large molecules that remain in the bloodstream to draw and hold in fluid, effectively expanding blood volume. Crystalloids (like normal saline and Ringer's lactate) consist of smaller particles and can also be used for fluid resuscitation, as they replicate blood plasma and promote hydration.

Using these fluid options allows for proper management of volume without compromising the patient's adherence to their beliefs. It's essential for healthcare providers to respect and accommodate such beliefs while also ensuring effective clinical care.