The correct option is C C
Let’s examine the sentence: “Every one, should refrain to do evil.” In Standard English, the verb “refrain” is followed by the preposition “from” and a gerund. Hence, in the sentence “to” would be replaced by “from” and “do” would be replaced by its gerund, “doing.” So, the correct sentence would be, “Every one, should refrain from doing evil.” Hence, the error is in Part C of the sentence. So, Option C is the correct answer.