What Explains the Relationship Between Indigenous Status, Age of Parent

What explains the relationship between Indigenous status, age of parent, and number of siblings?

A) Many Indigenous children are being raised by older parents who experience healthy economic circumstances and heavier caregiving responsibilities associated with multiple children.
B) Many Indigenous children are being raised by young parents who experience healthy economic circumstances and heavier caregiving responsibilities associated with multiple children.
C) Many Indigenous children are being raised by young parents who experience strained economic circumstances and heavier caregiving responsibilities associated with multiple children.
D) Many Indigenous children are being raised by young parents who experience strained economic circumstances and lighter caregiving responsibilities associated with multiple children.