164) ANSWER

A) The intravascular compartment becomes dehydrated.

RATIONALE

Fluid shifts from the intravascular compartment to the interstitial compartment due to damage to the cells' permeability, causing a drop in blood pressure and edema. Option 2 does occur in the beginning, but is not the reason for administering fluids. Notice the question asks about initially; options 3 and 4 would be appropriate rationales for decreasing fluid later on. Be sure both options are correct when choosing answers with more than one item mentioned.