What is the relationship between 'BG Group' and 'Royal Dutch Shell' in the context of the input sentence.
Options: distribution format, headquarters location, industry, parent organization

However, oil prices steadied in late trading, supporting shares such as BG Group (LSE: BG.L - news ) - up 6p to £10.77 - and Royal Dutch Shell A shares, which inched 20p higher to £18.38.
parent organization