Which sentence best summarized the intent of his oath?

by the lord before whom this sanctuary is holy, i will to n. be true and faithful, and love all which he loves and shun all which he shuns, according to the laws of god and the order of the world. nor will i ever with will or action, through word or deed, do anything which is in pleasing to him, on condition that he will hold me as i shall deserve it, and he will perform everything as it was in our agreement when i submitted myself to him and chose his will.

a) the vassal promises to worship the lord above god
b) the vassal promises to serve the lord under all conditions
c) the vassal promises to be loyal to his lord
d) the vassal promises to be faithful to god