Which of the following best describes a similarity between the Mexican Revolution of 1910 and the Russian Revolution of 1917? A. Both were initiated in response to invasions by foreign powers that helped draft new constitutions.

B. Both gained the support of government reformers holding high bureaucratic positions.

C. Both were led by members of the laboring classes who had risen through the ranks by supporting land redistribution policies.

D. Both were able to gain support because of the ineffectiveness and corruption of the existing monarchies.