The patient made a __________ of arranging the food on his plate.

In this sentence, the patient's behavior of arranging the food on his plate is described as having a repetitive and structured characteristic, which aligns with the term 'Ritualistic'. Ritualistic behavior often involves following a set pattern or sequence, which fits the context of the patient's actions. 'Formal' and 'Formalizing' do not capture the repetitive and structured nature of the behavior as effectively as 'Ritualistic'. 'Ritual' refers to a single instance of a set pattern, while 'Ritualistic' better conveys the ongoing nature of the behavior in this context.