Take context from the input text and decide on the accurate relationship between 'BG Group' and 'Royal Dutch Shell' from the options provided.
Options: parent organization, position held, owner of, distribution format

Energy companies took the most points off the index, with Royal Dutch Shell (Xetra: R6C1.DE - news ) and BG Group (LSE: BG.L - news ) closing down 3 and 1.8 percent respectively.
parent organization