Take context from the input text and decide on the accurate relationship between 'BG Group' and 'Royal Dutch Shell' from the options provided.
Options: director/manager, founded by, location of formation, parent organization

Glencore rose the most, up 3.2 percent, with fellow miner BHP Billiton (NYSE: BBL - news ) also among the biggest gainers, while energy companies BG Group (LSE: BG.L - news ) and Royal Dutch Shell (Xetra: R6C1.DE - news ) climbed 2.3 and 1.3 percent respectively.
parent organization