Which of the following statements is true?

a

There is concern about whether economic growth is sustainable. The earth only has a limited number of resources which are being consumed at alarming rates.

b

Those in defense of economic growth say that it has significantly reduced the standard of living of billions of people.

c

Those in defense of economic growth also say that human imagination can solve environmental and resource issues.

d

All of the above.

e

Only a) and c)