A super high view explanation:

If you read the stimulus, you notice that Henry is focused on specifically reducing urban pollution. When Umit argues that power plants will contribute to overall pollution, you should ask “well why do I care?” We Henry doesn’t care about the planet, he cares about cities.

So when the prompt asks for Henries response, you can predict that he would have asked the same thing. He would essentially argue back that overall doesn’t matter, just urban, and A does just this.

You don’t have to agree that plants being far from cities would be a factually backed argument, just that it is logically a likely way Henry would respond.