💡 Detailed Explanation
'Ukkari' is an adverb that describes doing something unintentionally due to a lack of attention. Choice 1, which describes accidentally passing a station because of being absent-minded, is the correct usage. For choice 2, 'shikkari' (thoroughly) would be appropriate. For choice 3, 'kyuu ni' (suddenly) or 'yukkuri' (slowly) would be suitable. For choice 4, 'fumajime na' (not serious) would be more fitting.