Explanation

The second blank has the strongest clue, so start there. The people who sit for only a few moments are contrasted with the bold who sit for several hours, so you need a word that means not bold. Of the choices, only irresolute fits.

Now go to the first blank: If some are described as sitting only briefly, and others for longer periods, then something that means period of time would make sense. Of the choices, only tenure can mean period of time. The third blank refers to the role the visitors play; since the visitors themselves are half of the performance, you might use a word like necessary to describe what kind of components they are. Integral is another word for necessary, so it’s the best fit.

Hence options B, D and G are correct!
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