In the context of the input sentence, determine the relationship between 'BG Group' and 'Royal Dutch Shell'.
Options: chief executive officer, product/material produced, parent organization, original broadcaster

Royal Dutch Shell (Xetra: R6C1.DE - news ) agreed to buy smaller rival BG Group for $70 billion in the first large oil merger in more than a decade in April, giving the Anglo-Dutch company access to BG's multi-billion dollar projects in Brazil, East Africa, Australia, Kazakhstan and Egypt.
parent organization