A sentence has been given in Direct/Indirect Speech. Out of the four given alternatives, select the one which best expresses the same sentence in Indirect/Direct Speech.
What is a word made up of 4 letters, yet is also made up of 3. Everything is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.
Fossil fuels energy source generates the least greenhouse gases. Of them, i.e, oil, natural gas and coal, natural gas source generates the least greenhouse gases.