What did Roosevelt mean when he said the United States must be an "arsenal of democracy”?

A. The United States would declare war on Japan and enter the war.
B. The United States should send troops to help defend Europe.
C. The United States must join the war and assist the Allies.
D. The United States could provide supplies to the Allies without joining the war
PLEASE HURRY THANKS

the answer is b. hope this

answer: in 1900, there were no "workplace safety laws"!

explanation: at the beginning of this century, workers in the united states faced remarkably high health and safety risks on the job.

a century ago in 1900 about three hundred out of every one hundred thousand miners were killed on the job each year.

[industria] developments occurred within a legal and regulatory climate that diminished employer’s interest in safety. as a result, americans developed production methods that were both highly productive and often very dangerous.