What I think he means is that the bystanders knew what was happening but didn't stand up for it. They didn't fight for the Jews rights. But in my opinion that statement is wrong since anyone who stood up or defended the Jews would be killed.
The answer is D. <span>figure and ground
Proximity refers to grouping principles which states objects withclose shapes will appear as group if being palced close to each other. Closure refers to our tendency to complete a figure when we see it in incomplete form.
Similarity refers to seeing something that resembles each other will lead our grouping perception.
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You need an adverb here, as it will modify the verb, not a noun (or is not a predicate) so the correct answer is "well" - option b.
