Option 1 -> Means to recover and rebuild one's life after a difficult or traumatic experience.
Option 2 -> Means to select carefully or be selective about choices; doesn't relate to emotional recovery.
Option 3 -> Means to search through something carefully; doesn't convey the meaning of moving forward after loss.
Option 4 -> A literal phrase about selecting a house; not an idiom and irrelevant to the context.
Hence, Option 1: pick up the pieces -> This idiom perfectly captures the struggle of recovering from a devastating loss and attempting to rebuild one's life after tragedy -> correct