Refer to the input text as context and select the correct relationship between 'BG Group' and 'Royal Dutch Shell' from the available options.
Options: chief executive officer, stock exchange, member of, parent organization

Merger and acquisition activity in the energy sector has been rekindled as company valuations slumped along with oil prices, highlighted by Royal Dutch Shell (Xetra: R6C1.DE - news ) 's $70 billion bid to acquire BG Group (LSE: BG.L - news ) earlier this year.
parent organization