Why Does Scientific and Technical Knowledge Seldom Translate Directly into Policy

Why does scientific and technical knowledge seldom translate directly into policy change?

A) Less developed countries do not have adequate scientific and technical knowledge to encourage policy change.
B) Groups negatively affected by policy change often mobilize to influence governmental decisions.
C) Scientific and technical information is usually not distributed widely enough to spark mobilization.
D) Groups negatively affected by policy change often face collective action problems,making mobilization difficult.