Nowhere from the text can we assume that the industrial sector accounts for at least fifty percent of Russia's economic activity.
The first sentence says that privatization has been slowed because of ownership claims. The last sentence makes clear two opposites: privatization is opposite of state ownership. B) asserts that the Russian government has been under a policy of subsdization ( similar to state ownership ) which creates large deficits that drive up the inflation rate and cause the ruble's value to decline
. Therefore, opening up Russian's economy will cause the ruble's value to decline