Which statement is true as it relates to major party competition in the United States today?

Question $21$Select one:

a$.$

The parties work together more today than in the $1960$s$.$

b$.$

The parties work together less today than at any time in the recent past.

c$.$

The parties work together more today than in the $1930$s$.$

d$.$

The parties work together less today than in the $1960$s but more than in the $1950$s$.$