Ellen, age 12, lives in the same household with her father, grandfather, and uncle. The cost of maintaining the household is provided by her grandfather (40%) and her uncle (60%). Disregarding tie-breaker rules, Ellen is a qualifying child to:

a. Only her father

b. Only her grandfather and uncle

c. All parties involved (i.e., father, grandfather, and uncle)

d. None of these

Please explain the answer