Brandon Is Retired and Lives with His Son,Charles

Brandon is retired and lives with his son,Charles.Charles and his sister and brother,Heloise and Barney,provide Brandon's total support:
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If the children file a multiple support agreement,which of the children are eligible to claim Brandon as a dependent?

A) None.
B) Only Charles.
C) Only Heloise.
D) Only Charles and Heloise.
E) Charles,Heloise,or Barney.