From 1973 to 1989 total energy use in this country increased less than 10 percent. However, the use of electrical energy in this country during this same period grew by more than 50 percent, as did the gross national product -- the total value of all goods and services produced in the nation. If the statements above are true, then which one of the following must also be true?
A: In 1989 electrical energy constituted a larger proportion of the energy used to produce the gross national product than did any other form of energy.
B: From 1973 to 1989 there was a decline in the use of energy other than electrical energy in this country.
C: Most of the energy used in this country in 1989 was electrical energy.
D: From 1973 to 1989 there was an increase in the proportion of energy use in this country that consisted of electrical energy use.
Choose A, B, C or D as your solution.
D