**Core Concept**
The question tests the understanding of the physiological response to massive blood loss, focusing on the body's compensatory mechanisms to maintain blood pressure and oxygen delivery to tissues. In the context of blood loss, the body activates various mechanisms to compensate for the loss of blood volume.

**Why the Correct Answer is Right**
Given that the correct answer is not provided, let's discuss the general principles. In response to blood loss, the body compensates by increasing heart rate, vascular resistance, and redirecting blood flow to vital organs. This is mediated through the sympathetic nervous system and the renin-angiotensin-aldosterone system.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific details of option A, we cannot directly address why it is incorrect. However, typically, options might include expected findings such as tachycardia or decreased urine output, which are indeed expected in the setting of significant blood loss.
**Option B:** Similarly, without specifics, we can't directly refute option B, but if it suggested an inappropriate compensation, such as a decrease in vascular resistance in the face of hypovolemia, it would be incorrect.
**Option C:** If option C mentioned an expected drop in hemoglobin immediately after blood loss, it might initially seem plausible but would be misleading as hemoglobin levels might not immediately reflect the loss due to the time it takes for fluid shifts and hemodilution to occur.
**Option D:** If this option suggested hypotension as an immediate and expected finding in a normotensive patient with normal hemoglobin who has suffered massive blood loss, it could be considered incorrect if the question implies the very early stages of blood loss where compensatory mechanisms are still effective.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that the body has robust compensatory mechanisms to deal with blood loss, including vasoconstriction and increased heart rate, which can initially maintain blood pressure despite significant volume loss. Recognizing the signs of uncompensated shock, such as hypotension, is crucial.

**Correct Answer:** Correct Answer: D. Hypotension.