Which one of the following is being tried India as a biofuel...

Biofuels are substances of biological origin which are used for production of heat and other form of energy. Often biologically generated hydrogen, methane, ethanol, butanol and diesal are referred to as biohydrogen, biomethane, bioethanol, biobutanol and biodiesal respectively. Petroplants are the plants which can yield large amount of latex having long chained liquid hydrocarbons, eg, Jatropha, Euphorbia (family-Euphorbiaceae) and other members of Euphorbiaceae, Asclepiadaceae, Apocyanaceae. Wood used as a source of energy is called fuel wood. The good fuel wood should be free from resin, much smoke and offensive odours. Hard wood are generally good fuel wood, eg, Azadirachta, Dalbergia, Terminalia, Casuarina.