The Evidence Regarding the Decline in Unionization in Canada Has

The evidence regarding the decline in unionization in Canada has indicated that:

A) there has been a fall in the likelihood that a worker with a given set of characteristics will be unionized.
B) shifts in the industrial and occupational composition of the labour force can explain it.
C) shifts in the demographic composition of the labour force can explain it.
D) workers find it easier to move between industries and countries.
E) this trend has occurred in almost all countries.