The three steps of john zaller's model of opinion formation are

The three steps are:
1) RECEIVE political stands and messages about an issue, so you can started the analyzation process.
2) ACCEPT the stands and messages after consideration and thought. This happen after the analyzation is done and you formed a conclusion.
3) SAMPLE of individual opinions through survey across the concerned area. So you can see whether other people also held the similar view/understanding with you.

It’s either d or b ! but it might be b

Accumulating more land so that your country can continue expanding without running into problems such as overpopulation