The correct option is
B Examine
'Look into' means to try to discover the facts about something such as a problem or a crime. Therefore option C is the correct answer because 'examine' means to look at or consider a person or thing carefully and in detail in order to discover something about them.
The other options are incorrect because 'to be a spectator' means to be a person who watches an activity, especially a sports event, without taking part, 'except' means not including; other than, 'watch' means to look at or observe attentively over a period of time and 'respect' refers to a feeling of deep admiration for someone or something elicited by their abilities, qualities, or achievements.