D - to serve. This is because the infinitive verb is the form of the verb before it has been conjugated to gain a person (I, you, he/she/it, we, you plural, they) and a tense. In English, such verbs are expressed as 'to ____', and this is how you will see them when you look them up in the dictionary.
I hope this helps
It’s D it makes the most sense
A. Would be correct because mayor is the subject and lives being the verb.
