True or False: A positive externality is a benefit to everyone at all times (pick the best answer and explanation below).

A. True, because a benefit for one person is a benefit for everyone.

B. False, because things that are benefits to some people may be costs for others, such as the smell of garlic.

C. False, because evaluation of benefits is different for different people and at different times.

D. False, because things that are benefits today may be costs in the future or may have been costs in the past. For example, puffing smokestacks used to be a symbol of economic wealth but are now thought of as pollution.

E. False, because a positive externality imposes costs, not benefits.