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.
Analyze the relationship between 'BG Group' and 'Royal Dutch Shell' within the context of the input sentence.
Options: position held, parent organization, distribution format, owner of