The correct option is B to look
The infinitive verb is a verb with the word 'to' in front of it. This verb is always just a verb. There is no - ed, no - ing, no - s at the end of the verb. Here, to-infinitive is used with adjective. 'Earlier' is an adjective in the sentence. Thus, options A, B, C and E are wrong according to the rule. The correct option is D since 'to' is in front of the verb 'look' and used with adjective.