What of the primary features of grassroots progassivism was the most essential to the continued growth of success of the reformist movement why

The reformation movement was a necessary Movement within the history of Europe the new spirit of enquiry oppose the practices of the Roman church.

Explanation:

It is that the variety of movement whose aim or target is to ascertain form of government. from the late 19th century through the primary decades of the twentieth century.

The reformation movement was a necessary Movement within the history of Europe the new spirit of enquiry oppose the practices of the Roman church.

it would have to be gasioline

i would go with the last one