By saying "a variant on the formula" (Line 1, Paragraph 4), the author means thatA.luxury-
By saying "a variant on the formula" (Line 1, Paragraph 4), the author means that
A.luxury-car rental is a new business.
B.foreign car-rental business is different from luxury-car clubs.
C.rental-car companies run in different ways.
D.rental-car business is newly developing.