They design and carry out projects aiming to reduce fossil fuel consumption, find [u]renewable[/u] fuels for public transport, and promote

They design and carry out projects aiming to reduce fossil fuel consumption, find renewable fuels for public transport, and promote other clean air efforts.
A. inexhaustible
b. recyclable
C. green
D. environmentally-friendly

Đáp án: A
Renewable = inexhautible (tái tạo được)