The answer is (1) an unknown enemy.
The other options are incorrect.
- (2) to want something impossible does not fit the meaning of the phrase. Snake in the grass is a metaphor for an enemy, while wanting something impossible is a literal statement.
- (3) make a conflict more intense does not fit the meaning of the phrase. Snake in the grass is a metaphor for an enemy, while making a conflict more intense is a literal statement.
- (4) to plan something does not fit the meaning of the phrase. Snake in the grass is a metaphor for an enemy, while planning something is a literal statement.
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