1) plagal
2) this can be debated everywhere because it depends on what "makes sense" I think it is a phrase but it could just as easily be a measure. a period would be too long and a cadence, while making sense, is a cadence, it ends a phrase. The answer the answer key is looking for will probs be a phrase.
3) phrases, period (answer D)
4) A: Authentic
hope his helps! good luck with the rest of Music Theory!
<span>Within some Muslim communities images of Muhammed have proliferated, while in other Muslim communities figurative art of any kind has been prohibited.;)</span>
The correct answer is B. Mozart. Hope this helps!
C. a short write up about each, or most, of the photos