The level of service exports worldwide increased nearly __ between 1980 and 2007: fourfold, sixfold, ninefold, twentyfold

The correct answer is twenty-fold.

Twenty fold refers to as having as equal to or holding as much as twenty times as many or much of a certain object. based on the given situation, between the years 1980 and 2007, the service exports worldwide increased twenty-fold, which means that service exports doubles as much as twenty times during the period of 1980 to 2007.