The word "concrete" in the second sentence of the passage means

A．Political presentations today are more like advertisements than in the past.
B．Politicians today tend to be more familiar with the views of citizens than in the past.
C．Citizens today are less informed about a politician's character than in the past.
D．Politician speeches today focus on details about issues than in the past.

A．had more influence over the selection of political candidates.
B．spent more money to promote their political candidates.
C．attracted more members.
D．received more money.