Answer:
Explanation:
The b7 takes the C# of a D major scale down to a regular C. This means that the notes in a D7 chord are D-F#-A-C. While a D7 can be used in any context, this type of chord can be found in a huge amount of jazz due to its massively ‘jazzy’ nature.
Answer c to record evidence
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It looks like maybe some kind of news reporter stage. Maybe like something important is happening, from the possible screen on the right it kinda looks similar to a building so possibly something to do with a news report on 9/11.