We must strengthen the Red Army's rear, subordinating all our work to this cause, all our industries must be got to work with greater intensity to produce more rifles, machine-guns, artillery, bullets, shells, airplanes; we must organize the guarding of factories, power stations, telephonic and telegraphic communications, and arrange effective air-raid protection in all localities.

Based on this excerpt, what is most likely the meaning of "subordinating"?
A. Placing in a lower or less important position B. Achieving with increased effort or energy C. Fighting to survive in difficult circumstances D. Joining with others to achieve a c