According to paragraph 1, the environmental goals...

Câu hỏi: According to paragraph 1, the environmental goals set by green builders were initially considered unrealistic presumably because ______.

A there was a lack of green builders at the beginning of the 20th century

B the potential applications of technology to constructing green buildings were not recognised then

C the problems of environment destruction were not prevalent at the time

D there was an abundance of natural materials for the construction of conventional buildings