In the Following Passage from the Records of the Manor

In the following passage from the records of the manor of Bernehorne (Thinking Like a Historian) , an unknown author cataloged the activities of the peasant John of Cayworth: "John of Cayworth holds a house and 30 acres of land and owes yearly 2 s., at Easter and Michaelmas; and he owes a cock and two hens at Christmas, of the value of 4 d.
And he ought to harrow for 2 days at the Lenten sowing with one man and his own horse and his own harrow; the value of the work being 4 d.; and he is to receive from the lord on each day 3 meals, of the value of 5 d., and then his food will be at a loss of 1 d. Thus his harrowing is of no value to the service of the lord.
And he ought to carry the manure of the lord for 2 days with one cart, with his own 2 oxen, the value of the work being 8 d.; and he is to receive from the lord each day 3 meals of the price as above. And thus the service is worth 3 d. clear."
Based on this passage, the author saw the relationship between serf and lord primarily in which of the following ways?

A) As a familial bond
B) As an expression of political loyalty
C) As a religious obligation
D) As an economic transaction