Take context from the input text and decide on the accurate relationship between 'BG Group' and 'Royal Dutch Shell' from the options provided.
Options: creator, legal form, parent organization, headquarters location

Oil major BP PLC BP., +6.04% BP, +5.98% tacked on 6%, Royal Dutch Shell PLC RDSB, +4.67% RDS.B, +3.60% rose 4.7% and BG Group PLC BG., +4.10% moved up 4.1%.
parent organization