The correct option is C That car appears to have broken down.
The infinitive verb is a verb with the word 'to' in front of it. There is no - ed, no - ing, no - s at the end of this verb. Here, infinitive verb is used to show the purpose or intention of an action. 'To' has the same meaning as in order to or so as to signify. Thus, options A, B and D are wrong according to the rule. The correct option is C.