The correct option is C glimpse
Option C is the correct answer because the sentence conveys that the person saw someone in the crowd for a 'fleeting moment' which means 'passing quickly'. Glimpse means 'a brief or partial view'. Thus, for this particular sentence option C is the correct answer.
Option A is incorrect because 'glare' means 'staring at someone angrily' which is not what is described in this sentence.
Option B is incorrect because 'glance' means to 'look briefly'. The sentence suggests an incident that happened quickly.
Option D is incorrect as 'look' is not grammatically right for the sentence.