The noun in bold letters is the political candidates corresponding to the subject of the sentence.
Option A is correct.
<h3>What is a noun?</h3>
A noun is one of an grammatical device being used to indicate the thing, a place or an individual in the sentence.
A sentence is made up of words, verbs, conjunctions and other grammatical devices. It has a subject , that is , the person or thing that performs the action, and the object, that is , receiving the action.
In the provided sentience, the political candidates are considered to be the subject as the action of making promise to the people are performing by them.
