D. It seems like the most reasonable answer. And there were also trading routes established during those times.
It was known as the Colombian exchange
The Tsar was related to the British Royal family. if he lost his power they'd lose thier influence.
One of the most effective tools utilized by management was the introduction of scabs or replacement works. The purpose of any strikes is to destabilize the work regimen in a plant or factory to obtain concessions from management. Scabs disrupt this process by crossing picket lines and continuing the work process. In this way, the strike is essentially undermined. Moreover, the striking workers were not allowed to return and thus forfeited their jobs.
