Of the Following Individuals, Who Is Engaged in an Humanitarian

Of the following individuals, who is engaged in an humanitarian effort?

A) Rebecca, a politician who is promoting lower tax rates for corporations
B) Jonathan, a military advisor who is striving to reduce nuclear armament
C) Nestore, a commuter who is considering buying a hybrid car to reduce fuel costs
D) Hannah, a kindergarten teacher who is considering a career change to stockbroker