Text of the medievel period strongly relied on who ?

William of Moerbeke's translations and editions of Greek philosophical texts in the middle half of the thirteenth century helped in forming a clearer picture of Greek philosophy, and in particular of Aristotle, than was given by the Arabic versions they had previously relied on, which had distorted or obscured the relation between Platonic and Aristotelian systems of philosophy.

Option a is the write answer

My answer is b but i dont know if im right