High-end luxury vehicles including the Bentley Mulsanne (just 13 miles per gallon combined), the Rolls Royce Phantom (14 mpg), the Mercedes-Benz Maybach S600 (15 mpg) and BMW 760Li (15 mpg) aren't helping.
What is the relationship between 'Rolls Royce Phantom' and 'BMW' in the context of the input sentence.
Options: chief executive officer, manufacturer, parent organization, industry