In what ways did american colonist gained government experience ?

In the back country, English laws were hardly enforceable and the pilgrims there for all intents and purposes lived under their own rule which gave them the experience to govern. The colonies had been rehearsing restricted types of self-government since the mid 1600s.  

Self-government was created by need with the earliest states in North America. The separations from Europe to the American drift were so extraordinary in the period of sail that it would never be attainable to specifically oversee from the home country.

letter d is correct.