John Stuart Mill Argues That Many Sciences Including Meteorology Must

John Stuart Mill argues that many sciences including meteorology must couch their results in terms of
Probabilities. With respect to psychology, he believed

A) that there could be a basic psychology, but not an applied psychology.
B) there could be both a basic and an applied psychology.
C) we could make probabilistic statements, but they would not be sufficiently exact to be helpful.
D) it could really never be a science.