What makes the vehicle in the picture ‘environmentally friendly’?

Question topic: ,
A: It's powered by gravity
B: It's powered by diesel
C: It's powered by electricity
D: It's powered by unleaded petrol
View hint

Trams are powered by electricity and therefore don’t emit exhaust fumes. They ease traffic congestion by offering drivers an alternative to using their car, particularly in busy cities and towns.


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Question topic: ,