From an Evolutionary Standpoint, the Shift for a Couple from Passionate

From an evolutionary standpoint, the shift for a couple from passionate to companionate love is adaptive, because passionate love facilitates ____________ and companionate love facilitates____________.

A) instability; a stable bond
B) detraction from group bonding; integration into a group
C) procreation; parenting
D) instability and detraction from group bonding; a stable bond and integration into a group