Choice (4) contemplation means:
1. the act of contemplating; thoughtful observation.
2. full or deep consideration; reflection: religious contemplation.
3. purpose or intention.
4. prospect or expectation.
Choice (2) deliberation means:
1. careful thought or discussion done in order to make a decision
2. the quality of being slow and careful
Hence in this case,
The mountaineers were caught in a crevice so they sat in deep ______ of their next plan of action.
choice (4) would be more suitable than choice (2) Hope this helps.
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