Isabel has a large family.Which pair would have equal degrees of relatedness to Isabel

A)  her father, and her brother
B)  Her son, and her aunt 
C)  Her brother, and her first cousin
D)  her grandfather, and her daughter

Relatedness

The feeling or state of being connected to others, often considered a fundamental human need.

Grandfather

A parent of one's father or mother and a significant male elder in the family.

Cousin

A family member who shares one set of grandparents with you, either on your mother's or father's side.