| A. | which songs | |||
| B. | it was her singing | |||
| C. | whose singing | | ||
D. | who sang |
I agree that C is the correct answer. D would work if you changed the sentence Mahalia Jackson, who sang songs that combined powerful vitality with great dignity, was one of the best known gospel singers in the US. However, even that sentence isn't exactly right because we usually associate vitality and dignity with the way someone sings, not with the songs themselves.
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yaasaayBut why do I think it's d and not c?D would be