The road to serfdom: a. advocated for laissez-faire economics. b.offered an intellectual basis for the critique of active government. c.was written by an austrian-born economist who embraced the label of "conservative" all of his life.

I believe the answer is: 
1.advocated for laissez-faire economics.
2.offered an intellectual basis for the critique of active government.

Serfdom refers to the situation that exist in the middle age, when lord and nobles control the majority of the land and the peasants are working on the land for small cuts of the profit.
This situation is most likely exist on laissez faire economics where there is little to no government interference and tend to criticize that government are limiting the market freedom.

Yes you are cute answer theories to explain the colonization of the new world the last great habitable landmass to be occupied by humans focus on the bering land bridge, or beringia, which emerge by siberia and alaska the last ice age.