The correct option is A to go
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. Thus, option B is wrong according to the rule. Option C and D are not applied with present tense thus they are wrong. The correct option is A since 'to' is in front of the verb 'go' which makes it infinitive verb.