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.
What is the relationship between 'BG Group' and 'Royal Dutch Shell' in the context of the input sentence.
Options: chief executive officer, parent organization, stock exchange, member of