Option 4 (D), (A), (C), (B) -> This creates the logical sentence: "Mountaineering requires patience, skill, and determination as climbers must endure harsh weather conditions to navigate steep and unpredictable terrains and push their physical limits to reach the summit." The sentence begins with the main clause (D), completes it with (A), flows into describing conditions with (C), and concludes with the final action (B). -> correct