Yesterday’’s skepticism was based on ignorance of the law of economic growth，and today’’s assurance ________________ (反映了人们对经济本质的误解).

A．In science, it is not difficult to distinguish fact from fiction.
B．Today few people have any notions of the meaning of science.
C．Practical-minded people can understand the meaning and objectives of pure science.
D．Scientists engaged in theoretical research should not be blamed for ignoring the practical side of their discoveries.