Why Are Laws Passed by Congress Often in Line with the Status

Why are laws passed by Congress often in line with the status quo?

A) The Supreme Court will strike down extreme legislation.
B) Most representatives are close to the center of the ideological distribution.
C) Presidents favor the status quo and will only sign bills close to it.
D) The type of broad support needed to pass legislation generates moderate legislation.
E) Most laws passed by Congress are far from the status quo.