Its B none of the other answers work
The correct answer is B A worn yellow quilt was lying at the foot of the antique bed, a gift from their grandmother.
This is a run-on sentence because there shouldn't be a comma after bed. It should be an entirely new sentence after, or something like a dash or a semi colon.
D. A journalist who researched documented cases of abuse over the past 5 years.
I believe it's C because the author is directing the traits at the character in this case Harry.