Using sugar as an alternative fuel source raises many concerns. which of the following is not a concern?
a. sugar can be grown and produced in a relatively short time period
b. sugar may require more energy to produce than it would supply
c. sugar may become too expensive for people to make desserts
d. sugar might become difficult to find in grocery stores.

A. sugar can be grown and produced in a relatively short time period

Explanation:

The sugar powered cars may be used in future. This may be a new source of fuel. This is likely to be grown easily and particularly in short time as compared to conventional fossil fuels such as coal, petroleum and natural gas which takes several years for the synthesis under the surface of earth. The concerns related with the use of this alternative fuel source includes the energy and technology demands necessary for the production of the alternative fuel source. The cost of sugar will increase with the increase in the demand for the generation of fuel and as an edible commodity. The increase in use of sugar for the generation of fuel may limit the quantity of the sugar available in the grocery store.