A. Prices for palm fruit fell between 1980 and 1984 following the rise in production and a concurrent fall in demand.

B. Imported trees are often more productive than native trees because the imported ones have left behind their pests and diseases in their native lands.

C. Rapid increases in productivity tend to deplete trees of nutrients needed for the development of the fruit-producing female flowers.

D. The weevil population in Asia remained at approximately the same level between 1980 and 1984.

E. Prior to 1980 another species of insect pollinated the Asian palm trees, but not as efficiently as the species of weevil that was introduced in 1980.