Fill in the blank with a suitable form of a verb.

Read ___________, nor to believe, but to weigh and consider.

Option C is incorrect because the word 'contradictory' is not a verb but is a noun. Option B, 'contradict not to' is also inaccurate because the main verb 'contradict' should be followed by the auxiliary or helping verb 'to' and not vice versa. Option A writes 'to not contradict', whereas option D writes 'not to contradict'. In option A, 'not' comes between 'to' and 'contradict', causing a split infinitive. Option D is more precise and is therefore the correct answer.