The correct answer is - D. To provide equality of wealth.
Providing an equality of wealth of everyone in the country is one of the main goals of the textbook socialism. In practice it never really worked that way, because still there was an upper class that was much wealthier that all the other people in the country, but partially was implemented with making the wages as much as possible to be on the same level for most of the citizens, and also lots of big landowners had forcefully lost most of their land so that it can be given into smaller pieces to the other people that did not owned any land.