Answer: B) Cornelius Vanderbilt and the $1 million endowment he gave to Vanderbilt University.
"Robber barons" were powerful businessmen of the 19th-century United States who made their fortunes through dubious practices. Some of these morally questionable strategies are monopolies, the formation of trusts, exploitation of workers, etc. Cornelius Vanderbilt is an example of this type of industrialist. Moreover, a donation to Vanderbilt University is likely to be seen by most people as a "philanthropic" or charitable act.
The groups that would be excluded from this widening of political opportunity would be any group that is denied the right to vote, whether this means they are oppressed or in prison, etc.