Which of the following statements regarding trends in the FBO industry is not correct?

a. Airframe manufacturers are directly competing in a number of traditional FBO service areas.

b. Conforming to governmental regulations for such things as underground fuel storage tanks is a lesser problem today than it was during the 1980s.

c. Insurance premiums have risen since the late 1980s.

d. Corporate self-fueling has been on the increase at many airports.