Which of the following is true?

a)The feudal system entailed embedded reciprocity in that serfs contributed agricultural output and military service in return for access to land, protection and food security in times of famine.

b)Adam Smith argued that there was no division of labour in the production of clothing.

c)Feudalism resulted in free trade of goods and services across Europe.

d)Feudal society rested on the slave mode of production

e)According to Polanyi, Western Melanesian society was an early manifestation of class conflict.