Answer:
Repairing the bike is the most environmentally friendly option.
Step-by-step explanation:
There is not much difference between the price of new bike and the cost of repairing the old bike. People usually prefer to buy new one if there is such a small difference in price. But because the most environmentally friendly option is asked, then repairing the bike is the most appropriate option. Because if you go for buying the new bike, you will trash the old one. This will increase trash in the environment. So if you go for repairing the old bike, you are saving the environment.