ऊंचाई की स्थितियों (सूची I) को उनके शारीरिक या पर्यावरणीय परिणामों (सूची II) के साथ सुमेलित कीजिए: सूची I (ऊंचाई की स्थिति): (A) हाइपोबैरिक वातावरण (Hypobaric environment) (B) हाइपोक्सिया (Hypoxia) (C) आंशिक दबाव में कमी (Partial pressure reduction) (D) निर्जलीकरण (Dehydration) सूची II (परिणाम): (I) ऑक्सीजन ग्रहण करने की क्षमता में कमी (II) हवा का तापमान कम होना (III) वायुमंडलीय दबाव में कमी (IV) फुफ्फुसीय वेंटिलेशन (pulmonary ventilation) में वृद्धि

Given below are two statements, one labeled as Assertion (A) and the other as Reason (R): Assertion (A): High altitude itself acts as a stressor, and exercising at high altitudes is highly stressful because less oxygen is available to the body compared to sea level. Reason (R): The fractional percentage of oxygen in the air at high altitudes remains the same as at sea level, but the total barometric pressure decreases with increasing altitude. In the light of the statements above, choose the correct option:

An increase in the blood's oxygen-carrying capacity provides the most important longer-term adjustment to altitude exposure. Which of the following factors account for this adaptation? A. Initial decrease in plasma volume B. Increase in erythrocytes C. Increase in hemoglobin synthesis D. Initial increase in plasma volume