Utilize the input text as a context reference, choose the right relationship between BG Group and Royal Dutch Shell from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

LONDON, Sept 8 (Reuters) - A look at valuations illustrates how regulatory concerns and stubbornly low energy prices have stoked investor anxiety over Royal Dutch Shell (Xetra: R6C1.DE - news ) 's planned takeover of British rival BG Group (LSE: BG.L - news ) .

Answer: parent_organization