Final answer:
Option 4: When climbing a mountain, experts suggest that you assess your physical and mental conditioning, learn basic climbing techniques, and purchase the right equipment while also understanding the subjective and objective hazards.
Step-by-step explanation:
The best summary of the selection 'How to Climb a Mountain' is Option 4: When climbing a mountain, experts suggest that you assess your physical and mental conditioning, learn basic climbing techniques, and purchase the right equipment while also understanding the subjective and objective hazards.
This option provides a comprehensive overview of the factors to consider when climbing a mountain, including personal preparation, acquiring skills and knowledge, and being aware of the potential dangers.
This summary encompasses all the essential aspects of climbing a mountain, emphasizing the importance of being prepared and informed to ensure a safe and successful climb.