If a person commutes just a few miles to school, which of the following would be the most practical and most energy-efficient method of transportation - based on the reason given?
a. a bike would be practical for more than 10 miles in cold climate.
b. public transportation is always available in every metropolitan area.
c. if the commute is only a few miles, an electric car would be practical.
d. walking is always the most practical.

Option B, Public transportation is always available in every metropolitan area.

Explanation:

Now a days all countries and its major cities are promoting usage of public transportation for three main reasons -

a) To reduce the pollution caused by exhaust released from vehicles

b) To reduce the traffic congestion.

c) Reduction is traffic congestion in turn leads to saving of fuel

Thus, usage of public transportation is the most convenient, sustainable, energy efficient and economic mode of transport

Option B is correct

the answer to your question is b