Which of the following was an obstacle to progress in russia in the 1800s?
a. a rigid social structure
b. few natural resources
c. a powerful middle class
d. little productive land

Not d or were a massive country with plenty of resources, just not developed enough to use it efficiently. and their social structure didn't really come around until the u.s.s.r. therefore, it has to be although i've never heard of a powerful middle