Answer:
A. Both mountain climbers were pushing themselves too much by risking to climb in the harsh weather.
Step-by-step explanation:
The word "ambitious" is used to suggest someone who has a strong determination to finish or get success or try to finish a job or anything. This word is more often used in a positive sense.
According to the passage, the word "ambitious" is used by one of the team members when Tenzin Norgay and Edmund Hillary revealed their plan to climb the mountain with just the two of them. The team member’s use of the word "too ambitious" suggests that they are risking their lives by deciding to "complete the vertical ascent with 30 pounds of luggage on their backs."
Thus, the correct answer is option A.